i386: Add AVX512BW dependency to AVX512BITALG

Since some of the AVX512BITALG intrins use 32/64 bit mask,
AVX512BW should be implied.

gcc/ChangeLog:

	* common/config/i386/i386-common.cc
	(OPTION_MASK_ISA_AVX512BITALG_SET):
	Change OPTION_MASK_ISA_AVX512F_SET
	to OPTION_MASK_ISA_AVX512BW_SET.
	(OPTION_MASK_ISA_AVX512F_UNSET):
	Remove OPTION_MASK_ISA_AVX512BITALG_SET.
	(OPTION_MASK_ISA_AVX512BW_UNSET):
	Add OPTION_MASK_ISA_AVX512BITALG_SET.
	* config/i386/avx512bitalgintrin.h: Do not push avx512bw.
	* config/i386/i386-builtin.def:
	Remove redundant OPTION_MASK_ISA_AVX512BW.
	* config/i386/sse.md (VI1_AVX512VLBW): Removed.
	(avx512vl_vpshufbitqmb<mode><mask_scalar_merge_name>):
	Change the iterator from VI1_AVX512VLBW to VI1_AVX512VL.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/avx512bitalg-vpopcntb-1.c:
	Remove avx512bw.
	* gcc.target/i386/avx512bitalg-vpopcntb.c: Ditto.
	* gcc.target/i386/avx512bitalg-vpopcntbvl.c: Ditto.
	* gcc.target/i386/avx512bitalg-vpopcntw-1.c: Ditto.
	* gcc.target/i386/avx512bitalg-vpopcntw.c: Ditto.
	* gcc.target/i386/avx512bitalg-vpopcntwvl.c: Ditto.
	* gcc.target/i386/avx512bitalg-vpshufbitqmb-1.c: Ditto.
	* gcc.target/i386/avx512bitalg-vpshufbitqmb.c: Ditto.
	* gcc.target/i386/avx512bitalgvl-vpopcntb-1.c: Ditto.
	* gcc.target/i386/avx512bitalgvl-vpopcntw-1.c: Ditto.
	* gcc.target/i386/avx512bitalgvl-vpshufbitqmb-1.c: Ditto.
	* gcc.target/i386/pr93696-1.c: Ditto.
	* gcc.target/i386/pr93696-2.c: Ditto.