Make closures optimizable by Crankshaft compiler.

src/scopes.h

Index: src/scopes.h
diff --git a/src/scopes.h b/src/scopes.h
index d909b81fc1f420d41ca273e702522c70b015ad2c..df36d038561001039c87c9521c6625f688b11725 100644
--- a/src/scopes.h
+++ b/src/scopes.h
@@ -302,6 +302,14 @@ class Scope: public ZoneObject {
 
   explicit Scope(Type type);
 
+  void InsertAfterScope(Scope* scope) {
+    inner_scopes_.Add(scope);
+    outer_scope_ = scope->outer_scope_;
+    outer_scope_->inner_scopes_.RemoveElement(scope);
+    outer_scope_->inner_scopes_.Add(this);
+    scope->outer_scope_ = this;
+  }
+
   // Scope tree.
   Scope* outer_scope_;  // the immediately enclosing outer scope, or NULL
   ZoneList<Scope*> inner_scopes_;  // the immediately enclosed inner scopes
@@ -355,6 +363,10 @@ class Scope: public ZoneObject {
   int num_stack_slots_;
   int num_heap_slots_;
 
+  // Serialized scopes support.
+  bool resolved_;
+  void MarkAsResolved() { resolved_ = true; }
+
   // Create a non-local variable with a given name.
   // These variables are looked up dynamically at runtime.
   Variable* NonLocal(Handle<String> name, Variable::Mode mode);