Merged r18697 into 3.22 branch.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 4e817664f0fef5a102675d116629d4ca37584632..ee3468e8aa675310ac6caec8846731a80db65c93 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -2453,6 +2453,7 @@ HConstant::HConstant(Handle<Object> handle, Representation r)
     has_smi_value_ = has_int32_value_ && Smi::IsValid(int32_value_);
     double_value_ = n;
     has_double_value_ = true;
+    // TODO(titzer): if this heap number is new space, tenure a new one.
   } else {
     is_internalized_string_ = handle->IsInternalizedString();
   }
@@ -2651,6 +2652,9 @@ void HConstant::PrintDataTo(StringStream* stream) {
   } else {
     handle(Isolate::Current())->ShortPrint(stream);
   }
+  if (!is_not_in_new_space_) {
+    stream->Add("[new space] ");
+  }
 }