AVX-512. Add cvtps2 insn patterns.

AVX-512. Add cvtps2 insn patterns.

gcc/
	* config/i386/sse.md
	(define_insn
	"<sse2_avx_avx512f>_fix_notrunc<sf2simodelower><mode><mask_name>"):
	Add masking.
	(define_insn "fix_truncv8sfv8si2<mask_name>"): Ditto.
	(define_insn "fix_truncv4sfv4si2<mask_name>"): 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>
From-SVN: r215545