AVX512FP16: Add expander for rint/nearbyinthf2.

gcc/ChangeLog:

	* config/i386/i386.md (rinthf2): New expander.
	(nearbyinthf2): New expander.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/avx512fp16-builtin-round-1.c: Add new testcase.
2 files changed