[ObjCARC Debug Message] - Added debug message when we add a tail keyword to a function which can never be passed stack args.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171675 91177308-0d34-0410-b5e6-96231b3b80d8
[ObjCARC Debug Message] - Added debug message when we add a nounwind keyword to a function which can not throw.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171676 91177308-0d34-0410-b5e6-96231b3b80d8