sse.md (avx512f_cmp<mode>3): Extend to support masking.

sse.md (avx512f_cmp<mode>3): Extend to support masking.

        * config/i386/sse.md (avx512f_cmp<mode>3): Extend to support masking.
        (avx512f_ucmp<mode>3): Ditto.
        (avx512f_eq<mode>3): Ditto.
        (avx512f_gt<mode>3): Ditto.
        (avx512f_testm<mode>3): Ditto.
        (avx512f_testnm<mode>3): Ditto.
        * config/i386/subst.md (SUBST_S): New.
        (mask_scalar_merge_name): Ditto.
        (mask_scalar_merge_operand3): Ditto.
        (mask_scalar_merge_operand4): Ditto.
        (mask_scalar_merge): 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: r206080