Emit write barrier for old space constants.

src/crankshaft/hydrogen-instructions.h

Index: src/crankshaft/hydrogen-instructions.h
diff --git a/src/crankshaft/hydrogen-instructions.h b/src/crankshaft/hydrogen-instructions.h
index 4035e79d844db2a67ba6321cc554a127e9d8eb0d..1cc0820785e785057e7915e789ba005ebd0b8b79 100644
--- a/src/crankshaft/hydrogen-instructions.h
+++ b/src/crankshaft/hydrogen-instructions.h
@@ -5498,11 +5498,6 @@ inline bool ReceiverObjectNeedsWriteBarrier(HValue* object,
     if (HAllocate::cast(object)->IsNewSpaceAllocation()) {
       return false;
     }
-    // Stores to old space allocations require no write barriers if the value is
-    // a constant provably not in new space.
-    if (value->IsConstant() && HConstant::cast(value)->NotInNewSpace()) {
-      return false;
-    }
   }
   return true;
 }