ARM: delete two tests now integrated into the larger files

Somehow forgot to git rm these two files. I believe I left the remaining
invalid* tests intentionally, though whether my reasons were sound is a
different matter.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186663 91177308-0d34-0410-b5e6-96231b3b80d8