AVX512: Restrict default masks for prefetch gather/scatter

AVX512: Restrict default masks for prefetch gather/scatter
instructions.

gcc/

	PR target/69228
	* config/i386/sse.md (define_expand "avx512pf_gatherpf<mode>sf"):
	Change first operand predicate from register_or_constm1_operand
	to register_operand.
	(define_expand "avx512pf_gatherpf<mode>df"): Likewise.
	(define_expand "avx512pf_scatterpf<mode>sf"): Likewise.
	(define_expand "avx512pf_scatterpf<mode>df"): Likewise.
	(define_insn "*avx512pf_gatherpf<mode>sf"): Remove.
	(define_insn "*avx512pf_gatherpf<mode>df"): Likewise.
	(define_insn "*avx512pf_scatterpf<mode>sf"): Likewise.
	(define_insn "*avx512pf_scatterpf<mode>df"): Likewise.
	* config/i386/i386.c (ix86_expand_builtin): Remove first operand
	comparison with constm1_rtx from vec_prefetch_gen part.

gcc/testsuite

	PR target/69228
	* gcc.target/i386/avx512pf-vscatterpf0dpd-1.c: Adjust.
	* gcc.target/i386/avx512pf-vscatterpf0dps-1.c: Likewise.
	* gcc.target/i386/avx512pf-vscatterpf0qpd-1.c: Likewise.
	* gcc.target/i386/avx512pf-vscatterpf0qps-1.c: Likewise.
	* gcc.target/i386/avx512pf-vscatterpf1dpd-1.c: Likewise.
	* gcc.target/i386/avx512pf-vscatterpf1dps-1.c: Likewise.
	* gcc.target/i386/avx512pf-vscatterpf1qpd-1.c: Likewise.
	* gcc.target/i386/avx512pf-vscatterpf1qps-1.c: Likewise.

From-SVN: r232324