[X86] Use intrinsics table for VPMULHRSW intrincis so that the legacy...

[X86] Use intrinsics table for VPMULHRSW intrincis so that the legacy intrinsics can select EVEX encoded instructions when available.

This requires a minor rename of the instructions due to the use of different tablegen classes and how the names are concatenated.

llvm-svn: 285501