Add flag to tracing element kind transitions

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 291c3c843940dc8b7e853d329816161b3f26ef8c..5e04e70b5ca1076d7eb3ece72149fa22913bcacc 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -112,6 +112,11 @@ PropertyDetails PropertyDetails::AsDeleted() {
   }
 
 
+bool Object::IsFixedArrayBase() {
+  return IsFixedArray() || IsFixedDoubleArray();
+}
+
+
 bool Object::IsInstanceOf(FunctionTemplateInfo* expected) {
   // There is a constraint on the object; check.
   if (!this->IsJSObject()) return false;