Use baseline code to compute message locations.

src/scopes.h

Index: src/scopes.h
diff --git a/src/scopes.h b/src/scopes.h
index 021b7b3b17820a8aae3da5aa20096c846d7f056d..4b8fe4997b46a151439be29e70f9d30de261c240 100644
--- a/src/scopes.h
+++ b/src/scopes.h
@@ -190,9 +190,9 @@ class Scope: public ZoneObject {
   // the additional requests will be silently ignored.
   void SetIllegalRedeclaration(Expression* expression);
 
-  // Visit the illegal redeclaration expression. Do not call if the
+  // Retrieve the illegal redeclaration expression. Do not call if the
   // scope doesn't have an illegal redeclaration node.
-  void VisitIllegalRedeclaration(AstVisitor* visitor);
+  Expression* GetIllegalRedeclaration();
 
   // Check if the scope has (at least) one illegal redeclaration.
   bool HasIllegalRedeclaration() const { return illegal_redecl_ != NULL; }