Clean up some messiness in Scopes.

src/ia32/virtual-frame-ia32.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1295 matching lines @@
   ASSERT(expr->IsTrivial());
 
   Literal* lit = expr->AsLiteral();
   if (lit != NULL) {
     Push(lit->handle());
     return;
   }
 
   VariableProxy* proxy = expr->AsVariableProxy();
   if (proxy != NULL) {
-    Slot* slot = proxy->var()->slot();
+    Slot* slot = proxy->var()->AsSlot();
     if (slot->type() == Slot::LOCAL) {
       PushLocalAt(slot->index());
       return;
     }
     if (slot->type() == Slot::PARAMETER) {
       PushParameterAt(slot->index());
       return;
     }
   }
   UNREACHABLE();
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32