re PR go/59432 (sync/atomic FAILs on 32bit x86 systems without .cfi directives)

re PR go/59432 (sync/atomic FAILs on 32bit x86 systems without .cfi directives)

	PR go/59432
	* config/i386/sync.md (atomic_compare_and_swap<dwi>_doubleword):
	Remove the second alternative.
	(regprefix): Remove mode attribute.
	(atomic_compare_and_swap<mode>): Do not fixup operand 2.
	* config/i386/predicates.md (cmpxchg8b_pic_memory_operand): Remove.

	Revert:
	2013-11-05  Ian Lance Taylor  <iant@google.com>

	* config/i386/sync.md (atomic_compare_and_swap<dwi>_doubleword):
	If possible, add .cfi directives to record change to bx.
	* config/i386/i386.c (ix86_emit_cfi): New function.
	* config/i386/i386-protos.h (ix86_emit_cfi): Declare.

From-SVN: r216281