Added DEBUG message when ObjCARC replaces a call which returns its argument verbatim...

Added DEBUG message when ObjCARC replaces a call which returns its argument verbatim with its argument to temporarily undo an optimization.

Specifically these calls return their argument verbatim, as a low-level
optimization. However, this makes high-level optimizations
harder. We undo any uses of this optimization that the front-end
emitted. We redo them later in the contract pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171346 91177308-0d34-0410-b5e6-96231b3b80d8