Hydrogen object literals: always initialize in-object properties

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index ad98f7c074fe8e34a66ad1dbcb1fcc6dc910498a..48e333f019d91ce828f78806c925c3776c0248b0 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -2505,6 +2505,9 @@ class HOptimizedGraphBuilder : public HGraphBuilder, public AstVisitor {
   void BuildInlinedCallArray(Expression* expression, int argument_count,
                              Handle<AllocationSite> site);
 
+  void BuildInitializeInobjectProperties(HValue* receiver,
+                                         Handle<Map> initial_map);
+
   class PropertyAccessInfo {
    public:
     PropertyAccessInfo(HOptimizedGraphBuilder* builder,