If there is a definition of an ObjCInterfaceDecl, make it the Decl returned from the corresponding ObjCInterfaceType

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@146740 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/DeclObjC.cpp b/lib/AST/DeclObjC.cpp
index 317dc95..02cc988 100644
--- a/lib/AST/DeclObjC.cpp
+++ b/lib/AST/DeclObjC.cpp
@@ -225,7 +225,11 @@
 void ObjCInterfaceDecl::allocateDefinitionData() {
   assert(!hasDefinition() && "ObjC class already has a definition");
   Data = new (getASTContext()) DefinitionData();
-  Data->Definition = this;  
+  Data->Definition = this;
+
+  // Make the type point at the definition, now that we have one.
+  if (TypeForDecl)
+    cast<ObjCInterfaceType>(TypeForDecl)->Decl = this;
 }
 
 void ObjCInterfaceDecl::startDefinition() {