[PATCH][i386,AVX] Enable VBMI2 support [1/7]

[Koval, Julia]

Hi,
This patch enables VBMI2 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_AVX512VBMI2_SET,
        OPTION_MASK_ISA_AVX512VBMI2_UNSET): New.
        (ix86_handle_option): Handle -mavx512vbmi2.
        config/i386/cpuid.h: Add bit_AVX512VBMI2.
        config/i386/driver-i386.c (host_detect_local_cpu): Handle new bit.
        config/i386/i386-c.c (__AVX512VBMI2__): New.
        config/i386/i386.c (ix86_target_string): Handle -mavx512vbmi2.
        (ix86_valid_target_attribute_inner_p): Ditto.
        config/i386/i386.h (TARGET_AVX512VBMI2, TARGET_AVX512VBMI2_P): New.
        config/i386/i386.opt (mavx512vbmi2): New option.

0003-VBMI2-option.patch
Description: 0003-VBMI2-option.patch