Enable VNNI support [1/5]

Enable VNNI support [1/5]

gcc/
	* common/config/i386/i386-common.c (OPTION_MASK_ISA_AVX512VNNI_SET,
	OPTION_MASK_ISA_AVX512VNNI_UNSET): New.
	(ix86_handle_option): Handle -mavx512vnni.
	* config/i386/cpuid.h (bit_AVX512VNNI): New bit.
	* config/i386/driver-i386.c (host_detect_local_cpu): Handle new bit.
	* config/i386/i386-c (__AVX512VNNI__): New.
	* config/i386/i386.c (ix86_target_string): Handle new option.
	(ix86_valid_target_attribute_inner_p): Handle new option.
	* config/i386/i386.h (TARGET_AVX512VNNI, TARGET_AVX512VNNI_P): New.
	* config/i386/i386.opt (mavx512vnni): New option.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@255401 138bc75d-0d04-0410-961f-82ee72b054a4