Fix "existant" typos

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193579 91177308-0d34-0410-b5e6-96231b3b80d8
Add llvm/test/Transforms/SLPVectorizer/ARM/lit.local.cfg. Tests there require ARM in targets.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193580 91177308-0d34-0410-b5e6-96231b3b80d8