2011-06-07 Ivan Maidanski <ivmai@mail.ru>

2011-06-07  Ivan Maidanski  <ivmai@mail.ru>

	* src/atomic_ops/sysdeps/gcc/arm.h: Handle ARMv6M architecture.
	* src/atomic_ops/sysdeps/gcc/arm.h (AO_test_and_set): Force "swp"
	instruction usage (instead of ldrex/strex) if AO_FORCE_USE_SWP;
	add a comment.
	* src/atomic_ops/sysdeps/gcc/arm.h
	(AO_compare_double_and_swap_double): Handle ARMv7EM architecture
	(similar to ARMv7M).
	* src/atomic_ops/sysdeps/gcc/arm.h (AO_test_and_set, AO_nop_full,
	AO_load, AO_store): Define at the end of file (in case not defined
	previously).