[PATCH][i386,AVX] Enable VAES support [3/5]

Wed, 08 Nov 2017 04:38:51 -0800 

Hi, this patch enables VAESDECLAST instruction from VAES isaset, defined here: 
https://software.intel.com/sites/default/files/managed/c5/15/architecture-instruction-set-extensions-programming-reference.pdf

Ok for trunk?
Thanks,
Julia

gcc/
        * config/i386/i386-builtin.def (__builtin_ia32_vaesdeclast_v16qi,
        __builtin_ia32_vaesdeclast_v32qi, __builtin_ia32_vaesdeclast_v64qi): 
New.
        * config/i386/sse.md (vaesdeclast_<mode>): New pattern.
        * config/i386/vaesintrin.h (_mm256_aesdeclast_epi128,
        _mm512_aesdeclast_epi128, _mm_aesdeclast_epi128): New intrinsics.

gcc/testsuite/
        * gcc.target/i386/avx512f-aesdeclast-2.c: New test.
        * gcc.target/i386/avx512vl-aesdeclast-2.c
        * gcc.target/i386/avx512fvl-vaes-1.c: Handle new intrinsics.

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