[PATCH][i386,AVX] Enable VNNI support [1/5]

[Koval, Julia]

Hi,
This patch enables VNNI isaset option. The doc for isaset and instruction: 
https://software.intel.com/sites/default/files/managed/c5/15/architecture-instruction-set-extensions-programming-reference.pdf

Ok for trunk?

Thanks,
Julia

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.

0010-VNNI-option.patch
Description: 0010-VNNI-option.patch