Keep track of an @implementation's super class name location, if one was provided.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181039 91177308-0d34-0410-b5e6-96231b3b80d8
[analyzer] Start hacking up alternate control-flow edge generation.  WIP.  Not guaranteed to do anything useful yet.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181040 91177308-0d34-0410-b5e6-96231b3b80d8
Restore Richard's belief in me.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181042 91177308-0d34-0410-b5e6-96231b3b80d8