Lower AVX512 vector comparison to AVX version when dest is vector.

Lower AVX512 vector comparison to AVX version when dest is vector.

gcc/ChangeLog:

	PR target/96891
	PR target/98348
	* config/i386/sse.md (VI_128_256): New mode iterator.
	(*avx_cmp<mode>3_1, *avx_cmp<mode>3_2, *avx_cmp<mode>3_3,
	 *avx_cmp<mode>3_4, *avx2_eq<mode>3, *avx2_pcmp<mode>3_1,
	 *avx2_pcmp<mode>3_2, *avx2_gt<mode>3): New
	define_insn_and_split to lower avx512 vector comparison to avx
	version when dest is vector.
	(*<avx512>_cmp<mode>3,*<avx512>_cmp<mode>3,*<avx512>_ucmp<mode>3):
	define_insn_and_split for negating the comparison result.
	* config/i386/predicates.md (float_vector_all_ones_operand):
	New predicate.
	* config/i386/i386-expand.c (ix86_expand_sse_movcc): Use
	general NOT operator without UNSPEC_MASKOP.

gcc/testsuite/ChangeLog:

	PR target/96891
	PR target/98348
	* gcc.target/i386/avx512bw-pr96891-1.c: New test.
	* gcc.target/i386/avx512f-pr96891-1.c: New test.
	* gcc.target/i386/avx512f-pr96891-2.c: New test.
	* gcc.target/i386/avx512f-pr96891-3.c: New test.
	* g++.target/i386/avx512f-pr96891-1.C: New test.
	* gcc.target/i386/bitwise_mask_op-3.c: Adjust testcase.