Clean up some messiness in Scopes.

src/data-flow.cc

 // Copyright 2010 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 107 matching lines @@
   if (update->op() == Token::INC && term_value == Smi::kMaxValue) return NULL;
   if (update->op() == Token::DEC && term_value == Smi::kMinValue) return NULL;
 
   // Found a smi loop variable.
   return loop_var;
 }
 
 int AssignedVariablesAnalyzer::BitIndex(Variable* var) {
   ASSERT(var != NULL);
   ASSERT(var->IsStackAllocated());
-  Slot* slot = var->slot();
+  Slot* slot = var->AsSlot();
   if (slot->type() == Slot::PARAMETER) {
     return slot->index();
   } else {
     return fun_->scope()->num_parameters() + slot->index();
   }
 }
 
 
 void AssignedVariablesAnalyzer::RecordAssignedVar(Variable* var) {
   ASSERT(var != NULL);
@@ skipping 376 matching lines @@
   ASSERT(av_.IsEmpty());
 }
 
 
 void AssignedVariablesAnalyzer::VisitDeclaration(Declaration* decl) {
   UNREACHABLE();
 }
 
 
 } }  // namespace v8::internal