[ObjectiveC Migration]: Provide knobs for 
migrating setter/getter methods to an eventual
property declaraiton. This is wip.
// rdar://14345082


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185591 91177308-0d34-0410-b5e6-96231b3b80d8
Minor refactoring of my last patch.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185593 91177308-0d34-0410-b5e6-96231b3b80d8