[X86] Add show-mc-encoding to some fast-isel intrinsic tests so we can observe...

[X86] Add show-mc-encoding to some fast-isel intrinsic tests so we can observe a failure to select EVEX instructions.

The one I noticed is sqrtsss/sd, but there could be others.

I had to add a couple new tests that don't have insertelement in there to catch this on the fast-isel path. Otherwise we trigger an abort and use SelectionDAG.

llvm-svn: 336938