Added debug statement to ObjCARC when we replace objc_autorelease(x) with objc_release(x) when x is otherwise unused.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171673 91177308-0d34-0410-b5e6-96231b3b80d8
[ObjCARC Debug Messages] - Added missing newline.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171674 91177308-0d34-0410-b5e6-96231b3b80d8