Generate StoreGlobal stubs with Hydrogen

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 7442b5f6c0abe1c2787a23fdc51503d11b906fe7..fa4ed26b63a52b92ce742180066f2295f2d5b9ad 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -320,6 +320,8 @@ class HGraph: public ZoneObject {
   HConstant* GetConstantNull();
   HConstant* GetInvalidContext();
 
+  bool IsStandardConstant(HConstant* constant);
+
   HBasicBlock* CreateBasicBlock();
   HArgumentsObject* GetArgumentsObject() const {
     return arguments_object_.get();
@@ -1479,7 +1481,12 @@ class HOptimizedGraphBuilder: public HGraphBuilder, public AstVisitor {
 
   bool inline_bailout() { return inline_bailout_; }
 
-  void AddSoftDeoptimize();
+  enum SoftDeoptimizeMode {
+    MUST_EMIT_SOFT_DEOPT,
+    CAN_OMIT_SOFT_DEOPT
+  };
+
+  void AddSoftDeoptimize(SoftDeoptimizeMode mode = CAN_OMIT_SOFT_DEOPT);
 
   void Bailout(const char* reason);