Consumed analysis: check destructor calls.
This allows the callable_when attribute to be attached to destructors.
Original patch by chris.wailes@gmail.com, reviewed and edited by delesley.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@192508 91177308-0d34-0410-b5e6-96231b3b80d8