Update lang/gcc49 to 4.9.4.  Changes since 4.9.3:

* libsanitizer merge from upstream r191666 breaks bootstrap on powerpc64-linux and aarch64-linux
* [6 regression] sparc bootstrap failure: sparc.c:4919:6: error: suggest explicit braces to avoid ambiguous 'else'
* [4.9/5/6 Regression] Miscompilation of glibc on i686-linux starting with r234101
* [4.9/5/6 regression] Performance regression of 410.bwaves on x86.
* [4.9/5/6 Regression] gcc.dg/torture/pr44913.c FAILs with -O3 -fno-dce -fno-forward-propagate
* [4.9/5/6 Regression] Inline memcmp is *much* slower than glibc's
* [4.9/5/6 Regression] ICE: Maximum number of LRA constraint passes is achieved (30)
* [4.9/5/6 Regression] Another label as values ICE in gen_reg_rtx
* [4.9 Regression] ICE on valid code on x86_64-linux-gnu: verify_gimple failed
* [4.9 Regression] i386: -fshrink-wrap can interact badly with trampolines
* [4.9 Regression] wrong code at -O1 and above on x86_64-linux-gnu
* [4.9 Regression] gcc.c-torture/execute/pr68376-2.c FAILs with -ftracer
* [4.9 Regression] ICE (segfault) at -Os on x86_64-linux-gnu in ""fail_abnormal_edge_coalesce""
* [4.9 Regression] ICE in connect_traces
* [4.9 Regression] ICE on invalid code on x86_64-linux-gnu in operator[]
* [4.9 Regression] gcc ICE at -O1 and above  on valid code on x86_64-linux-gnu with 窶徭eg fault窶�
* [4.9 Regression] gcc ICE at -O3 and above on valid code on x86_64-linux-gnu in ""replace_uses_by""
* [4.9/5/6 regression] fipa-cp-clone ignores thunk
* [4.9/5/6 Regression] Corrupt truncated function
* [4.9 Regression] Issue with using declaration and member class template
* [4.9/5/6 Regression] failure to determine size of static constexpr array that is nested within a templated class
* [4.9/5/6 Regression] expression of typeid( expression ) is evaluated twice
* [4.9/5/6 Regression] decltype and sfinae to check for template instance availability fails to compile
* [5/6/7 regression] ICE with polymorphic lambda
* [5/6/7 Regression] Missing copy elision with operator new
* [4.9 Regression]ICE: unrecognizable insn compiling arm-fp16 testcases with -march=armv7-a and -mrestrict-it
* [4.9/5/6 Regression] ICE: in recog_memoized
* [4.9 Regression][ARM] ICE: fail to generate BIC(immediate) instruction
* [4.9/5/6 Regression] Bad ARM code generated for evaluating unsigned int bitfield value
* [4.9 Regression] Extremely long compile time for generated code
* [4.9 regression] m68k misoptimisation with -fschedule-insns
* [4.9/5/6 Regression] ICE in -flto -fmerge-all-constants -fno-use-linker-plugin targetting i686-w64-mingw32
* [4.9 Regression] ICE when comparing vectors
* [4.9/5/6 Regression] -Wparentheses missing ambiguous else warning
* [4.9/5/6 Regression] ICE on invalid C++ code on x86_64-linux-gnu: Segmentation fault
* [4.9/5/6 Regression] ICE: in merge_exception_specifiers
* [4.9/5/6 regression] GCC emits incorrect fixed->fp conversion instruction on Cortex-M4 target
* [4.9/5 Regression] extern ""C"" functions in src/c++11/thread.cc are global in libstdc++.a
* [4.9 Regression] DOM confuses complete unrolling which in turn causes VRP to warn
* [4.9 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu
* [4.9 Regression] ICE at -Os and above with -g enabled on x86_64-linux-gnu
* [4.9 Regression] ICE at -O2 and -O3 on x86_64-linux-gnu
* [4.9 Regression] gcc ICE at -O2 and -O3 on x86_64-linux-gnu in hide_evolution_in_other_loops_than_loop
* [4.9 regression] ICE: in store_bit_field_1
* [4.9 Regression] Wrong optimization with aliasing and access via char
* [5/6 Regression] ICE on valid code at -O2 and -O3 with -g enabled in simplify_subreg
* [4.9/5/6 Regression] Geode optimizations incorrectly return -NaN
* [5 Regression] wrong code with -O2 and vector arithmetics @ x86_64
* [4.9/5 Regression] uncaught_exception() equals to `true' after rethrow_exception()
* [4.9/5 Regression] Mistakenly unsupported tests in g++.dg/torture/
* [4.9/5/6 regression] incorrect memcpy expansion with unrolled_loop strategy at -O2
* [4.9/5 Regression] Segmentation fault on a template class
* [4.9/5 Regression] compile error when including valarray
* [4.9/5/6 Regression] deduction failure with trailing return type in function template argument
* ICE on -O2 and above on x86_64-linux-gnu (internal compiler error: in get_expr_operands
* powerpc64 bootstrap with -mcmodel=small results in linker error
* libatomic fails to build with -Os on powerpc64-linux
* ICE: in emit_move_insn
* [4.9/5 Regression] gcc hangs on valid code on x86_64-linux-gnu
* configure incorrectly strips $target_alias from PLUGIN_LD_SUFFIX
* [x86] 'asm' operand has impossible constraints with -fstack-check
* broken support for attribute init_priority
* [4.9/5/6 Regression] wrong code with -mbmi2
* Missing ""not"" breaks Ada.Text_IO.Get_Immediate(File
* [4.9 Regression] Crash in preprocessor including stdc-predef.h when it does not exist on glibc-based systems
* [4.9 Regression] libgomp.c/appendix-a/a.29.1.c -O2 -g: type mismatch between an SSA_NAME and its symbol
* [4.9 Regression] all pch tests fail on eglibc systems (with bits/predefs.h)
* [4.9 regression] On-stack VLA does not cause instrumentation with -fstack-protector
* [4.9 Regression] OpenMP workshare problem with SUM()
* [4.9/5/6 Regression] Wrong code with single element vector insert
* wrong code with -mstringop-strategy=libcall @ i686
* [4.9 Regression] ICE at -O1 and above on x86_64-linux-gnu in gen_lsm_tmp_name
* Wrong code with -O1.
* [4.9 Regression] ICE on valid code at -O2 and -O3 on x86_64-linux-gnu: in execute_todo
* [4.9/5 Regression] ICE: verify_gimple failed (type mismatch in shift expression
* [4.9 Regression] ICE in lower_omp_target
* [4.9/5/6/7 Regression] g++ accepts an unreachable function catch block that lacks a corresponding try
* [4.9/5/6 Regression] incorrect ""is protected within this context"" error
* Incorrect code generated for tail call
* [4.9/5/6 Regression][arm] Wrong code for FP mult-by-power-of-2 + int conversion
* [4.9/5/6 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu
* [4.9/5/6 Regression] Wrong thumb2_ior_scc_strict_it insn pattern.
* [4.9/5 Regression] Wrong barrier placement for 64-bit atomic loads on arm
* ARM -mcpu=native can cause a double free abort.
* [AArch64] aarch64_vmls pattern should be rejected if -ffp-contract=off
* ICE: tree check: expected integer_cst
* false positive signed negation
* Crash with abi_tag attribute
* [4.9/5 Regression] ICE in gimple_call_arg with bogus posix_memalign
* [4.9/5/6 Regression] ICE on  __builtin_alloca_with_align with small alignment
* vnmul
* [5 Regression] ICE for array of a derived type with allocatable class in derived type object
* [4.9/5/6 Regression] ""error: too few arguments to function"" in c++14 but not c++11
* error with multiple enable_shared_from_this base classes
* --fast-math breaks std::signbit function
* std::random_device Ignores Read Return Code (CVE-2015-5276)
* Wrong value category used in _Bind functor
* [4.9/5/6 Regression] Including both <tr1/functional> and <functional> can cause ADL problems in std::function SFINAE
* [4.9/5 Regression] std::copy/std::move broken with trivial move-only types
* -ftree-loop-if-convert-stores miscompiles gfortran.dg/elemental_optional_args_3.f90
* ifcombine joins together floating point expression with side effects
* [4.9 Regression] gcc ICE at -O3 and __sigsetjmp with 窶徼ree check: expected ssa_name
* [4.9 Regression] ICE: in tree_to_shwi
* [4.9/5 Regression] Wrong optimization of stores to _Bool via char*
* [4.9
* FAIL: gcc.dg/debug/dwarf2/discriminator.c scan-assembler on x86_64-apple-darwin10
* gcc doesn't conform to Solaris 32-bit ABI by expecting 16-byte stack alignment
* [4.9/5/6/7 Regression] Incorrect PPC assembly due to inserted .machine pseudo-op
* libgfortran: warning: left shift of negative value [-Wshift-negative-value]
* [4.9/5/6] gcc.target/i386/readeflags-1.c aborts on -march=i586 or on -miamcu
* ICE: gcc.target/i386/avx512f-klogic-2.c
* [4.9/5 Regression] incorrect load address on manual vector shuffle
* [PATCH] gcc 4.8.4 fails to compile with -march=native on VIA nano CPU
* ICE at -O1 and above on x86_64-linux-gnu in int_mode_for_mode
* [4.9/5/6 Regression] ""gcc -m32 -finstrument-functions -ffixed-ebp"" produces internal compiler error
* ICE: in extract_insn
* Alpha: Error: No lda !gpdisp!278 was found
* [7 Regression] Lots of ASAN and libgo runtime FAILs after r236090
* [7 Regression] ICE on trunk gcc on ivybridge target (df_refs_verify)
* __tls_get_addr is called with misaligned stack on x86-64
* [4.9/5 Regression] Compiling glibc-2.17
* Crash when selecting specializations through aliases.
* gcc 4.9.0 fails to execute dsymutil when linking executables on darwin
* [4.9 Regression] bootstrap with -O3 gives comparison failure
* [4.9/5/6 regression] Memory leak with assignment to array of derived types with allocatable components
* [4.9/5 Regression] ICE (segmentation fault) on sh4-linux-gnu
* [4.9 Regression] Compiling with -fstack-protector-strong causes binary to segfault
* wrong code for bit-field struct at -O1 and above on x86_64-linux-gnu
* ""^[a-z0-9][a-z0-9-]*$"
* s-osinte-rtems.ads is out of synch with type definitions of current newlib
* Regular expressions: Backreferences don't work in negative lookahead
* [4.9/5/6 Regression] basic_string constructor and throwing iterators
* [4.9 only] test case gcc.dg/and-1.c fails on power for gcc 4.9
* [4.9 Regression] Several hundred asan failures with 4.9.4 on x86_64-apple-darwin15
* [4.9/5/6/7 regression] S/390: Memory access below stack pointer in epilogue
* [4.9 regression] ICE at -O1 and above on x86_64-linux-gnu (in output_constant_pool_2
* ALLOCATE with size given by a module function
* [meta-bug] Port tail-merge fixes to 4.9
* [4.9/5/6 Regression] No backtrace generated for array bounds violation
* [4.9/5/6 Regression] Internal compiler error for Fortran files when specifying a file instead of an include directory with -I
* [4.9/5/6/7 Regression] ICE on missing end program in fixed source
* [4.9/5/6/7 Regression] incorrect reading of values from file on Windows
* [4.9/5/6/7 Regression] ICE in gfc_trans_structure_assign
* [4.9/5/6 Regression] FAIL: gfortran.dg/class_allocate_18.f90
* [4.9/5 Regression] Wrong code with allocatable deferred-length (array) function results
* [4.9 Regression] ICE on invalid: ""Bad array reference"" for an undeclared loop variable
* [4.9/5 Regression] ICE on allocating character array with source
* [4.9/5 Regression] Wrong length when allocating character array
* [4.9/5 Regression] ICE on function result with procedure pointer component
* [4.9 Regression] ICE with -g in native_encode_initializer
* [4.9/5/6 Regression] Errors in ""make -k check-gcc RUNTESTFLAGS=plugin.exp""
* [4.9/5/6 regression] Bootstrapping on x86_64-pc-kfreebsd-gnu fails with ""s-taprop.adb:717:32: ""lwp_self"" is undefined""
* [4.9/5/6 regression] Bootstrapping on x86_64-pc-kfreebsd-gnu fails with ""s-taprop.adb:856:10: ""pthread_attr_setaffinity_np"" is undefined (more references follow)""
* [4.9/5/6 regression] ICE in gcc/java/lang.c:427 with -fdump-tree-all
* [4.9/5/6 Regression] ICE: in create_linear_expr_from_tree
* [4.9/5/6 Regression] -ftree-loop-linear: large compile time / memory usage
* [4.9/5/6 Regression] ICE in gen_reg_rtx
* [4.9/5/6 Regression] libada bootstrap failure on kfreebsd (""pthread_rwlock_t"" not declared in ""OS_Interface"")
* [4.9/5/6 Regression] libbacktrace causes undefined symbol ""_Unwind_GetIPInfo"" on ia64-hpux
* [4.9/5/6 Regression] endless loop with -O2 -floop-parallelize-all
* [4.9 Regression] [graphite] Segmentation fault with -Ofast -floop-parallelize-all -ftree-parallelize-loops
* [4.9/5/6 Regression] Build of i686-pc-linux-android is broken
* [4.9 Regression] Free-form source code: -Wline-truncation is no longer enabled by default
* [4.9 Regression] ICE: FORALL writing multiple elements of one array
* [4.9/5/6 Regression] ICE on invalid code on x86_64-linux-gnu in tree check: expected function_type or method_type
* [4.9/5/6 Regression] gcc 4.9+ miscompiles code on hppa
* [4.9/5/6/7 Regression] ICE in analyze
* [4.9 /5/6 Regression] ICE in get_narrower
* [4.9/5/6 Regression] Build failure: undefined symbol __floatunsitf
* [4.9/5/6 Regression] ICE when renaming predefined ""="" and ""/=""
* [4.9/5/6 Regression] ICE: in compute_affine_dependence

(jperkin)