AVX-512. Add vpshuf[lh]w insn patterns.

AVX-512. Add vpshuf[lh]w insn patterns.

gcc/
	* config/i386/sse.md
	(define_c_enum "unspec"): Add UNSPEC_PSHUFHW, UNSPEC_PSHUFLW.
	(define_insn "<mask_codefor>avx512bw_pshuflwv32hi<mask_name>"): New.
	(define_expand "avx512vl_pshuflwv3_mask"): Ditto.
	(define_insn "avx2_pshuflw_1<mask_name>"): Add masking.
	(define_expand "avx512vl_pshuflw_mask"): New.
	(define_insn "sse2_pshuflw_1<mask_name>"): Add masking.
	(define_insn "<mask_codefor>avx512bw_pshufhwv32hi<mask_name>"): New.
	(define_expand "avx512vl_pshufhwv3_mask"): Ditto.
	(define_insn "avx2_pshufhw_1<mask_name>"): Add masking.
	(define_expand "avx512vl_pshufhw_mask"): New.
	(define_insn "sse2_pshufhw_1<mask_name>"): Add masking.

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>
From-SVN: r215544