Objective-C. Better fix for my previous patch 
"No need to issue deprecated warning if deprecated method 
in class extension is being implemented in primary class implementation
(no overriding is involved).
// rdar://16249335". No functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204159 91177308-0d34-0410-b5e6-96231b3b80d8