AVX-512. Add masked vunpck[lh]pd.

AVX-512. Add masked vunpck[lh]pd.

gcc/
	* config/i386/sse.md
	(define_insn "avx_unpckhpd256<mask_name>"): Add masking.
	(define_insn "avx512vl_unpckhpd128_mask"): New.
	(define_expand "avx_movddup256<mask_name>"): Add masking.
	(define_expand "avx_unpcklpd256<mask_name>"): Ditto.
	(define_insn "*avx_unpcklpd256<mask_name>"): Ditto.
	(define_insn "avx512vl_unpcklpd128_mask"): New.

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: r215493