Fix representation requirement in HReturn.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 9d526434493f0ea1905ab79abc3614d50d7c46b0..062b5ae7ace247dc6a38891952d77c0f827c7143 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -2531,6 +2531,7 @@ 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();
   }
@@ -2729,6 +2730,9 @@ void HConstant::PrintDataTo(StringStream* stream) {
   } else {
     handle(Isolate::Current())->ShortPrint(stream);
   }
+  if (!is_not_in_new_space_) {
+    stream->Add("[new space] ");
+  }
 }