AVX-512. Add convert ps2pd and ps2dq.

AVX-512. Add convert ps2pd and ps2dq.

gcc/
	* config/i386/sse.md
	(define_insn
	"<fixsuffix>fix_trunc<mode><sselongvecmodelower>2<mask_name><round_saeonly_name>"):
	New.
	(define_insn "<fixsuffix>fix_truncv2sfv2di2<mask_name>"): Ditto.
	(define_insn "ufix_trunc<mode><sseintvecmodelower>2<mask_name>"): Ditto.
	(define_insn "sse2_cvtss2sd<round_saeonly_name>"): Change
	"nonimmediate_operand" to "<round_saeonly_nimm_predicate>".
	(define_insn "avx_cvtpd2ps256<mask_name>"): Add masking.
	(define_expand "sse2_cvtpd2ps_mask): New.
	(define_insn "*sse2_cvtpd2ps<mask_name>"): Add masking.
	(define_insn "sse2_cvtps2pd<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: r215586