ObjectiveC migrator: If we find a method that returns a C pointer 
of some sort (but not an object, block pointer or CF pointers), 
and is not annotated with the objc_returns_inner_pointer attribute, 
we should suggest NS_RETURNS_INNER_POINTER annotation for these methods. 


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@189707 91177308-0d34-0410-b5e6-96231b3b80d8