ObjectiveC: Handle the case of qualifying protocols
declared in a typedef declaraton used as super
class of an ObjC class. Curretnly, these protocols
are dropped from the class hierarchy. Test shows that
it is now included. // rdar://15051465


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191395 91177308-0d34-0410-b5e6-96231b3b80d8