AVX-512. Add vcvtps2[u]qq patterns.

AVX-512. Add vcvtps2[u]qq patterns.

gcc/
	* config/i386/sse.md
	(define_mode_iterator VI8_256_512): New.
	(define_insn "<mask_codefor>avx512dq_cvtps2qq<mode><mask_name><round_name>"):
	Ditto.
	(define_insn "<mask_codefor>avx512dq_cvtps2qqv2di<mask_name>"): Ditto.
	(define_insn "<mask_codefor>avx512dq_cvtps2uqq<mode><mask_name><round_name>"):
	Ditto.
	(define_insn "<mask_codefor>avx512dq_cvtps2uqqv2di<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: r214668