Now that the vectorizer can do tail-folding (rL367592), and the ARM backend
understands MVE masked loads/stores (rL371932), it's time to add the MVE
tail-folding equivalent of the X86 tests that I added.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@371996 91177308-0d34-0410-b5e6-96231b3b80d8
Sjoerd Meijer