re PR target/82641 (Unable to enable crc32 for a certain function with target attribu...

re PR target/82641 (Unable to enable crc32 for a certain function with target attribute on ARM (aarch32))

2018-02-06  Tamar Christina  <tamar.christina@arm.com>

	PR target/82641
	* config/arm/arm.c (arm_print_asm_arch_directives): Record already
	emitted arch directives.
	* config/arm/arm-c.c (arm_cpu_builtins): Undefine __ARM_ARCH and
	__ARM_FEATURE_COPROC before changing architectures.

gcc/testsuite
2018-02-06  Tamar Christina  <tamar.christina@arm.com>

	PR target/82641
	* gcc.target/arm/pragma_arch_switch_2.c: New.

From-SVN: r257410