Pull up the following, via patch, requested by maxv in ticket #897:

sys/arch/amd64/amd64/locore.S          1.166 (patch)
sys/arch/i386/i386/locore.S            1.157 (patch)
sys/arch/x86/include/cpu.h              1.92 (patch)
sys/arch/x86/include/fpu.h              1.9 (patch)
sys/arch/x86/x86/fpu.c                  1.33-1.39 (patch)
sys/arch/x86/x86/identcpu.c            1.72 (patch)
sys/arch/x86/x86/vm_machdep.c          1.34 (patch)
sys/arch/x86/x86/x86_machdep.c          1.116,1.117 (patch)

Support eager fpu switch, to work around INTEL-SA-00145.
Provide a sysctl machdep.fpu_eager, which gets automatically
initialized to 1 on affected CPUs.

(martin)