Infer HConstant::NotInNewSpace only if the supplied handle is null.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index bdcdc22890a8f80a28ef33e7640c1b52db6eb9af..ef454e2c4e4604310f861683e0a9cfaea04d9656 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -2869,7 +2869,7 @@ void HConstant::Initialize(Representation r) {
     // could cause heap object checks not to get emitted.
     object_ = Unique<Object>(Handle<Object>::null());
   }
-  if (r.IsSmiOrInteger32()) {
+  if (r.IsSmiOrInteger32() && object_.handle().is_null()) {
     // If it's not a heap object, it can't be in new space.
     bit_field_ = IsNotInNewSpaceField::update(bit_field_, true);
   }