Kill some dead code: classic frame element and const lists.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 2003d9b9e64b4fffaac7cfb83d5ef4bbd5f71c1e..12c9753bfa4b943e3013c9628f07ce8a239f1f8d 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1400,8 +1400,6 @@ Isolate::Isolate()
       ast_sentinels_(NULL),
       string_tracker_(NULL),
       regexp_stack_(NULL),
-      frame_element_constant_list_(0),
-      result_constant_list_(0),
       embedder_data_(NULL) {
   TRACE_ISOLATE(constructor);