Use the ASTMutationListener to track when a named decl gets added to a DeclContext,
meaning we need to rewrite its name lookup table in a chained PCH.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@117536 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Serialization/ASTWriterDecl.cpp b/lib/Serialization/ASTWriterDecl.cpp
index 5b403cf..3c6dd9b 100644
--- a/lib/Serialization/ASTWriterDecl.cpp
+++ b/lib/Serialization/ASTWriterDecl.cpp
@@ -638,7 +638,7 @@
   if (Writer.hasChain() && !D->isOriginalNamespace() &&
       D->getOriginalNamespace()->getPCHLevel() > 0) {
     NamespaceDecl *NS = D->getOriginalNamespace();
-    Writer.AddUpdatedNamespace(NS);
+    Writer.AddUpdatedDeclContext(NS);
 
     // Make sure all visible decls are written. They will be recorded later.
     NS->lookup(DeclarationName());