Propagate the ASTContext to various AST traversal and lookup functions.
No functionality change (really).

llvm-svn: 68726
diff --git a/clang/lib/AST/Builtins.cpp b/clang/lib/AST/Builtins.cpp
index 7eab267..97a40a4 100644
--- a/clang/lib/AST/Builtins.cpp
+++ b/clang/lib/AST/Builtins.cpp
@@ -201,7 +201,7 @@
   case 'P': {
     IdentifierInfo *II = &Context.Idents.get("FILE");
     DeclContext::lookup_result Lookup 
-      = Context.getTranslationUnitDecl()->lookup(II);
+      = Context.getTranslationUnitDecl()->lookup(Context, II);
     if (Lookup.first != Lookup.second && isa<TypeDecl>(*Lookup.first)) {
       Type = Context.getTypeDeclType(cast<TypeDecl>(*Lookup.first));
       break;