Generate StoreGlobal stubs with Hydrogen

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index adaa9cfb793f92e4f99bb1cc51324c0cff347c8c..d34058d7e675e51f1bc1a41754465fb558bfc988 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -8585,6 +8585,13 @@ class PropertyCell: public Cell {
   // property.
   DECL_ACCESSORS(dependent_code, DependentCode)
 
+  // Sets the value of the cell and updates the type field to be the union
+  // of the cell's current type and the value's type. If the change causes
+  // a change of the type of the cell's contents, code dependent on the cell
+  // will be deoptimized.
+  void SetValueInferType(Object* value,
+                         WriteBarrierMode mode = UPDATE_WRITE_BARRIER);
+
   // Casting.
   static inline PropertyCell* cast(Object* obj);
 
@@ -8612,6 +8619,8 @@ class PropertyCell: public Cell {
 
   void AddDependentCode(Handle<Code> code);
 
+  Type* UpdateType(Object* value);
+
  private:
   DECL_ACCESSORS(type_raw, Object)
   DISALLOW_IMPLICIT_CONSTRUCTORS(PropertyCell);