Add an ActOnNamespaceAliasDef action and have the parser call it.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67915 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDeclCXX.cpp b/lib/Sema/SemaDeclCXX.cpp
index 9098304..349aafd 100644
--- a/lib/Sema/SemaDeclCXX.cpp
+++ b/lib/Sema/SemaDeclCXX.cpp
@@ -1675,6 +1675,15 @@
     S->PushUsingDirective(UDir);
 }
 
+Sema::DeclTy *Sema::ActOnNamespaceAliasDef(Scope *CurScope, 
+                                           SourceLocation AliasLoc,
+                                           IdentifierInfo *Alias,
+                                           const CXXScopeSpec &SS,
+                                           SourceLocation NamespaceLoc,
+                                           IdentifierInfo *NamespaceName) {
+  return 0;
+}
+
 /// AddCXXDirectInitializerToDecl - This action is called immediately after 
 /// ActOnDeclarator, when a C++ direct initializer is present.
 /// e.g: "int x(1);"