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
diff --git a/lib/Sema/SemaDeclObjC.cpp b/lib/Sema/SemaDeclObjC.cpp
index 41f9683..f33e7bc 100644
--- a/lib/Sema/SemaDeclObjC.cpp
+++ b/lib/Sema/SemaDeclObjC.cpp
@@ -1045,7 +1045,7 @@
 
   ObjCImplementationDecl* IMPDecl =
     ObjCImplementationDecl::Create(Context, CurContext, IDecl, SDecl,
-                                   ClassLoc, AtClassImplLoc);
+                                   ClassLoc, AtClassImplLoc, SuperClassLoc);
 
   if (CheckObjCDeclScope(IMPDecl))
     return ActOnObjCContainerStartDefinition(IMPDecl);