[X86] Add more baseline tests for "irregular" shuffles. NFC.

This adds more tests for shuffles where the output width does not match
the input width and/or the output is generated from more than two inputs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281005 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed