[X86] Expand the testing of expand and compress intrinsics

[X86] Expand the testing of expand and compress intrinsics

The avx512f intrinsic tests were in the avx512vl file. We were also missing some combinations of masking.

This does show that we fail to use the zero masking form of expand loads when the passthru is zero. I'll try to get that fixed shortly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333795 91177308-0d34-0410-b5e6-96231b3b80d8