sse.md (pbroadcast_evex_isa): New mode attr.

sse.md (pbroadcast_evex_isa): New mode attr.

	* config/i386/sse.md (pbroadcast_evex_isa): New mode attr.
	(avx2_pbroadcast<mode>): Add another alternative with v instead
	of x constraints in it, using <pbroadcast_evex_isa> isa.
	(avx2_pbroadcast<mode>_1): Similarly, add two such alternatives.

	* gcc.target/i386/avx512bw-vpbroadcast-1.c: New test.
	* gcc.target/i386/avx512bw-vpbroadcast-2.c: New test.
	* gcc.target/i386/avx512bw-vpbroadcast-3.c: New test.
	* gcc.target/i386/avx512vl-vpbroadcast-1.c: New test.
	* gcc.target/i386/avx512vl-vpbroadcast-2.c: New test.
	* gcc.target/i386/avx512vl-vpbroadcast-3.c: New test.

From-SVN: r236369