Keep track when a ObjC interface/protocol was initially created as a forward reference.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@142230 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Serialization/ASTWriterDecl.cpp b/lib/Serialization/ASTWriterDecl.cpp
index a8243e5..2925f49 100644
--- a/lib/Serialization/ASTWriterDecl.cpp
+++ b/lib/Serialization/ASTWriterDecl.cpp
@@ -470,6 +470,7 @@
                                      IEnd = D->ivar_end(); I != IEnd; ++I)
     Writer.AddDeclRef(*I, Record);
   Writer.AddDeclRef(D->getCategoryList(), Record);
+  Record.push_back(D->isInitiallyForwardDecl());
   Record.push_back(D->isForwardDecl());
   Record.push_back(D->isImplicitInterfaceDecl());
   Writer.AddSourceLocation(D->getSuperClassLoc(), Record);
@@ -499,6 +500,7 @@
 
 void ASTDeclWriter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) {
   VisitObjCContainerDecl(D);
+  Record.push_back(D->isInitiallyForwardDecl());
   Record.push_back(D->isForwardDecl());
   Writer.AddSourceLocation(D->getLocEnd(), Record);
   Record.push_back(D->protocol_size());