Add optimized compiler support for generic global loads....

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
===================================================================
--- src/hydrogen-instructions.h	(revision 5936)
+++ src/hydrogen-instructions.h	(working copy)
@@ -106,6 +106,7 @@
 //     HGlobalReceiver
 //     HLeaveInlined
 //     HLoadGlobal
+//     HLoadGlobalGeneric
 //     HMaterializedLiteral
 //       HArrayLiteral
 //       HObjectLiteral
@@ -132,6 +133,7 @@
 //         HTypeofIs
 //       HLoadNamedField
 //       HPushArgument
+//       HStoreGlobal
 //       HTypeof
 //       HUnaryMathOperation
 //       HUnaryPredicate
@@ -214,6 +216,7 @@
   V(LeaveInlined)                              \
   V(LoadElements)                              \
   V(LoadGlobal)                                \
+  V(LoadGlobalGeneric)                         \
   V(LoadKeyedFastElement)                      \
   V(LoadKeyedGeneric)                          \
   V(LoadNamedField)                            \
@@ -2432,9 +2435,6 @@
   Handle<JSGlobalPropertyCell>  cell() const { return cell_; }
   bool check_hole_value() const { return check_hole_value_; }
 
-  virtual Representation RequiredInputRepresentation(int index) const {
-    return Representation::Tagged();
-  }
   virtual void PrintDataTo(StringStream* stream) const;
 
   virtual intptr_t Hashcode() const {
@@ -2456,6 +2456,27 @@
 };
 
 
+class HLoadGlobalGeneric: public HInstruction {
+ public:
+  HLoadGlobalGeneric(Handle<String> name, bool inside_typeof)
+      : name_(name), inside_typeof_(inside_typeof) {
+    set_representation(Representation::Tagged());
+    SetFlagMask(AllSideEffects());
+  }
+
+  virtual void PrintDataTo(StringStream* stream) const;
+
+  Handle<String> name() const { return name_; }
+  bool inside_typeof() const { return inside_typeof_; }
+
+  DECLARE_CONCRETE_INSTRUCTION(LoadGlobalGeneric, "load_global_generic")
+
+ private:
+  Handle<String> name_;
+  bool inside_typeof_;
+};
+
+
 class HStoreGlobal: public HUnaryOperation {
  public:
   HStoreGlobal(HValue* value, Handle<JSGlobalPropertyCell> cell)