Apply upstream commit:

From: ppalka <ppalka@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 27 Apr 2016 21:18:05 +0000
Subject: [PATCH] Reduce nesting of parentheses in conditionals generated by
genattrtab

gcc/ChangeLog:

* genattrtab.c (write_test_expr): New parameter EMIT_PARENS
which defaults to true.  Emit an outer pair of parentheses only if
EMIT_PARENS.  When continuing a chain of && or || (or & or |),
don't emit parentheses for the right-hand operand.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@235536

gcc/arm generates so many parens it hits a bracket depth limited which is
enforced by clang. This reduces the number of parens generated and avoids the
need to increase bracket depth.

Fixes PR toolchain/53178 properly.

(maya)