Squeeze the layout of variable proxy nodes.

src/scopes.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/scopes.h"
 
 #include "src/accessors.h"
 #include "src/bootstrapper.h"
@@ skipping 1013 matching lines @@
 }
 
 
 bool Scope::ResolveVariable(CompilationInfo* info,
                             VariableProxy* proxy,
                             AstNodeFactory<AstNullVisitor>* factory) {
   DCHECK(info->global_scope()->is_global_scope());
 
   // If the proxy is already resolved there's nothing to do
   // (functions and consts may be resolved by the parser).
-  if (proxy->var() != NULL) return true;
+  if (proxy->is_resolved()) return true;
 
   // Otherwise, try to resolve the variable.
   BindingKind binding_kind;
   Variable* var = LookupRecursive(proxy, &binding_kind, factory);
   switch (binding_kind) {
     case BOUND:
       // We found a variable binding.
       break;
 
     case BOUND_EVAL_SHADOWED:
@@ skipping 357 matching lines @@
 }
 
 
 int Scope::ContextLocalCount() const {
   if (num_heap_slots() == 0) return 0;
   return num_heap_slots() - Context::MIN_CONTEXT_SLOTS -
       (function_ != NULL && function_->proxy()->var()->IsContextSlot() ? 1 : 0);
 }
 
 } }  // namespace v8::internal