Add an ActOnNamespaceAliasDef action and have the parser call it.

llvm-svn: 67915
diff --git a/clang/lib/Sema/Sema.h b/clang/lib/Sema/Sema.h
index 37a1799..ab84559 100644
--- a/clang/lib/Sema/Sema.h
+++ b/clang/lib/Sema/Sema.h
@@ -1370,9 +1370,16 @@
                                       SourceLocation IdentLoc,
                                       IdentifierInfo *NamespcName,
                                       AttributeList *AttrList);
-
+  
   void PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir);
 
+  virtual DeclTy *ActOnNamespaceAliasDef(Scope *CurScope,
+                                         SourceLocation AliasLoc,
+                                         IdentifierInfo *Alias,
+                                         const CXXScopeSpec &SS,
+                                         SourceLocation NamespaceLoc,
+                                         IdentifierInfo *NamespaceName);
+  
   /// AddCXXDirectInitializerToDecl - This action is called immediately after 
   /// ActOnDeclarator, when a C++ direct initializer is present.
   /// e.g: "int x(1);"