Enable optimization of top-level code.

src/hydrogen-instructions.h

 // Copyright 2012 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 79 matching lines @@
   V(CheckSmi)                                  \
   V(ClampToUint8)                              \
   V(ClassOfTestAndBranch)                      \
   V(CompareIDAndBranch)                        \
   V(CompareGeneric)                            \
   V(CompareObjectEqAndBranch)                  \
   V(CompareMap)                                \
   V(CompareConstantEqAndBranch)                \
   V(Constant)                                  \
   V(Context)                                   \
+  V(DeclareGlobals)                            \
   V(DeleteProperty)                            \
   V(Deoptimize)                                \
   V(Div)                                       \
   V(ElementsKind)                              \
   V(EnterInlined)                              \
   V(FixedArrayBaseLength)                      \
   V(ForceRepresentation)                       \
   V(FunctionLiteral)                           \
   V(GetCachedArrayIndex)                       \
   V(GlobalObject)                              \
@@ skipping 1369 matching lines @@
 
   virtual Representation RequiredInputRepresentation(int index) {
     return Representation::Tagged();
   }
 
  protected:
   virtual bool DataEquals(HValue* other) { return true; }
 };
 
 
+class HDeclareGlobals: public HUnaryOperation {
+ public:
+  HDeclareGlobals(HValue* context,
+                  Handle<FixedArray> pairs,
+                  int flags)
+      : HUnaryOperation(context),
+        pairs_(pairs),
+        flags_(flags) {
+    set_representation(Representation::Tagged());
+    SetAllSideEffects();
+  }
+
+  HValue* context() { return OperandAt(0); }
+  Handle<FixedArray> pairs() const { return pairs_; }
+  int flags() const { return flags_; }
+
+  DECLARE_CONCRETE_INSTRUCTION(DeclareGlobals)
+
+  virtual Representation RequiredInputRepresentation(int index) {
+    return Representation::Tagged();
+  }
+ private:
+  Handle<FixedArray> pairs_;
+  int flags_;
+};
+
+
 class HGlobalObject: public HUnaryOperation {
  public:
   explicit HGlobalObject(HValue* context) : HUnaryOperation(context) {
     set_representation(Representation::Tagged());
     SetFlag(kUseGVN);
   }
 
   DECLARE_CONCRETE_INSTRUCTION(GlobalObject)
 
   virtual Representation RequiredInputRepresentation(int index) {
@@ skipping 3098 matching lines @@
 
   DECLARE_CONCRETE_INSTRUCTION(In)
 };
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_