x86: consolidate VPCLMUL tests

There's little point in having Intel syntax disassembler tests when the
purpose of a test is assembler functionality: Drop all
*avx512*_vpclmulqdq-wig1-intel.

For *avx512*_vpclmulqdq-wig1 share source with *avx512*_vpclmulqdq.

Finally put in place similar tests for -mvexwig=1.