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.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@214668 138bc75d-0d04-0410-961f-82ee72b054a4