First implementation of allocation elimination in Hydrogen.

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index dc7933aa20f05cecabc48f1fe9376893a85957f9..65fbead97388a0796e8fb3cb7115cd0c5bbcffa0 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -303,6 +303,9 @@ class Factory {
   Handle<JSObject> NewJSObjectFromMap(Handle<Map> map,
                                       PretenureFlag pretenure = NOT_TENURED);
 
+  Handle<JSObject> NewJSObjectFromMapForDeoptimizer(
+      Handle<Map> map, PretenureFlag pretenure = NOT_TENURED);
+
   // JS modules are pretenured.
   Handle<JSModule> NewJSModule(Handle<Context> context,
                                Handle<ScopeInfo> scope_info);