i386.md (prefetch): Allow TARGET_AVX512PF.

i386.md (prefetch): Allow TARGET_AVX512PF.

        * config/i386/i386.md (prefetch): Allow TARGET_AVX512PF.
        (*prefetch_avx512pf_<mode>): New.
        * config/i386/sse.md (avx512f_vmcmp<mode>3): Ditto.
        (avx512f_maskcmp<mode>3): Ditto.
        (vashrv16si3): Ditto.

Co-Authored-By: Andrey Turetskiy <andrey.turetskiy@intel.com>
Co-Authored-By: Anna Tikhonova <anna.tikhonova@intel.com>
Co-Authored-By: Ilya Tocar <ilya.tocar@intel.com>
Co-Authored-By: Ilya Verbin <ilya.verbin@intel.com>
Co-Authored-By: Kirill Yukhin <kirill.yukhin@intel.com>
Co-Authored-By: Maxim Kuznetsov <maxim.kuznetsov@intel.com>
Co-Authored-By: Michael Zolotukhin <michael.v.zolotukhin@intel.com>
Co-Authored-By: Sergey Lega <sergey.s.lega@intel.com>
From-SVN: r204130