ObjectiveC migration: complete migrating class
declaration to include list of protocols class
conforms to. 


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@186443 91177308-0d34-0410-b5e6-96231b3b80d8
Update for llvm API change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@186448 91177308-0d34-0410-b5e6-96231b3b80d8