Generate StoreGlobal stubs with Hydrogen

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 94f136143f0cafc6dbc772f587e3fa40d07cb742..6e10a383dea29e94befdcde26c02f258efb990e4 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -3291,6 +3291,7 @@ class HConstant: public HTemplateInstruction<0> {
             HType type,
             bool is_internalized_string,
             bool is_not_in_new_space,
+            bool is_cell,
             bool boolean_value);
 
   Handle<Object> handle() {
@@ -3339,6 +3340,10 @@ class HConstant: public HTemplateInstruction<0> {
            unique_id_ == UniqueValueId(heap->empty_string());
   }
 
+  bool IsCell() const {
+    return is_cell_;
+  }
+
   virtual Representation RequiredInputRepresentation(int index) {
     return Representation::None();
   }
@@ -3350,7 +3355,7 @@ class HConstant: public HTemplateInstruction<0> {
     return Representation::Tagged();
   }
 
-  virtual bool EmitAtUses() { return !representation().IsDouble(); }
+  virtual bool EmitAtUses();
   virtual void PrintDataTo(StringStream* stream);
   virtual HType CalculateInferredType();
   bool IsInteger() { return handle()->IsSmi(); }
@@ -3465,6 +3470,7 @@ class HConstant: public HTemplateInstruction<0> {
   bool has_double_value_ : 1;
   bool is_internalized_string_ : 1;  // TODO(yangguo): make this part of HType.
   bool is_not_in_new_space_ : 1;
+  bool is_cell_ : 1;
   bool boolean_value_ : 1;
   int32_t int32_value_;
   double double_value_;
@@ -5118,6 +5124,9 @@ inline bool ReceiverObjectNeedsWriteBarrier(HValue* object,
         HInnerAllocatedObject::cast(object)->base_object(),
         new_space_dominator);
   }
+  if (object->IsConstant() && HConstant::cast(object)->IsCell()) {
+    return false;
+  }
   if (object != new_space_dominator) return true;
   if (object->IsAllocateObject()) return false;
   if (object->IsAllocate()) {
@@ -5379,6 +5388,9 @@ class HObjectAccess {
   static HObjectAccess ForField(Handle<Map> map,
       LookupResult *lookup, Handle<String> name = Handle<String>::null());
 
+  // Create an access for the payload of a Cell or JSGlobalPropertyCell.
+  static HObjectAccess ForCellPayload(Isolate* isolate);
+
   void PrintTo(StringStream* stream);
 
   inline bool Equals(HObjectAccess that) const {