[ScalarizeMaskedMemIntrin] Add test cases for masked store expansion. Increase alignment of one of the masked load test cases.

The masked store alignment is being miscalculated, but masked load is correct.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@343283 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed