AVX512FP16: Add testcase for vcmpph/vcmpsh/vcomish/vucomish.
gcc/testsuite/ChangeLog:
* gcc.target/i386/avx512fp16-helper.h
(check_results_mask): New check_function.
* gcc.target/i386/avx512fp16-vcmpph-1a.c: New test.
* gcc.target/i386/avx512fp16-vcmpph-1b.c: Ditto.
* gcc.target/i386/avx512fp16-vcmpsh-1a.c: Ditto.
* gcc.target/i386/avx512fp16-vcmpsh-1b.c: Ditto.
* gcc.target/i386/avx512fp16-vcomish-1a.c: Ditto.
* gcc.target/i386/avx512fp16-vcomish-1b.c: Ditto.
* gcc.target/i386/avx512fp16-vcomish-1c.c: Ditto.
* gcc.target/i386/avx512fp16vl-vcmpph-1a.c: Ditto.
* gcc.target/i386/avx512fp16vl-vcmpph-1b.c: Ditto.