re PR target/82370 (AVX512 can use a memory operand for immediate-count vpsrlw, but...

re PR target/82370 (AVX512 can use a memory operand for immediate-count vpsrlw, but gcc doesn't.)

	PR target/82370
	* config/i386/sse.md (VI248_AVX2, VI248_AVX512BW, VI248_AVX512BW_2):
	New mode iterators.
	(<shift_insn><mode>3<mask_name>): Change the last of the 3
	define_insns for logical vector shifts to use VI248_AVX512BW
	iterator instead of VI48_AVX512, remove <mask_mode512bit_condition>
	condition, useless isa and prefix attributes.  Change the first
	2 of these define_insns to ...
	(<mask_codefor><shift_insn><mode>3<mask_name>): ... this, new
	define_insn for avx512vl.
	(<shift_insn><mode>3): ... and this, new define_insn without
	masking for non-avx512vl.

	* gcc.target/i386/avx-pr82370.c: New test.
	* gcc.target/i386/avx2-pr82370.c: New test.
	* gcc.target/i386/avx512f-pr82370.c: New test.
	* gcc.target/i386/avx512bw-pr82370.c: New test.
	* gcc.target/i386/avx512vl-pr82370.c: New test.
	* gcc.target/i386/avx512vlbw-pr82370.c: New test.

From-SVN: r253924