AVX-512. Add mov[dlh]dup insns support.

AVX-512. Add mov[dlh]dup insns support.

gcc/
	* config/i386/sse.md
	(define_insn "avx_movshdup256<mask_name>"): Add masking.
	(define_insn "sse3_movshdup<mask_name>"): Ditto.
	(define_insn "avx_movsldup256<mask_name>"): Ditto.
	(define_insn "sse3_movsldup<mask_name>"): Ditto.
	(define_insn "vec_dupv2df<mask_name>"): Ditto.
	(define_insn "*vec_concatv2df"): Add EVEX version.

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: r215589