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

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
===================================================================
--- src/hydrogen-instructions.h	(revision 7145)
+++ src/hydrogen-instructions.h	(working copy)
@@ -123,6 +123,7 @@
   V(LoadExternalArrayPointer)                  \
   V(LoadFunctionPrototype)                     \
   V(LoadGlobal)                                \
+  V(LoadGlobalGeneric)                         \
   V(LoadKeyedFastElement)                      \
   V(LoadKeyedGeneric)                          \
   V(LoadNamedField)                            \
@@ -2811,6 +2812,38 @@
 };
 
 
+class HLoadGlobalGeneric: public HTemplateInstruction<2> {
+ public:
+  HLoadGlobalGeneric(HValue* context,
+                     HValue* global_object,
+                     Handle<String> name,
+                     bool inside_typeof)
+      : name_(name), inside_typeof_(inside_typeof) {
+    SetOperandAt(0, context);
+    SetOperandAt(1, global_object);
+    set_representation(Representation::Tagged());
+    SetAllSideEffects();
+  }
+
+  virtual void PrintDataTo(StringStream* stream);
+
+  virtual Representation RequiredInputRepresentation(int index) const {
+    return Representation::None();
+  }
+
+  HValue* context() { return OperandAt(0); }
+  HValue* global_object() { return OperandAt(1); }
+  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,