Clean up dead code after spread desugaring

src/js/runtime.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This files contains runtime support implemented in JavaScript.
 
 // CAUTION: Some of the functions specified in this file are called
 // directly from compiled code. These are the functions with names in
 // ALL CAPS. The compiled code passes the first argument in 'this'.
 
@@ skipping 18 matching lines @@
   MakeTypeError = from.MakeTypeError;
   speciesSymbol = from.species_symbol;
 });
 
 utils.ImportFromExperimental(function(from) {
   FLAG_harmony_species = from.FLAG_harmony_species;
 });
 
 // ----------------------------------------------------------------------------
 
-/* -----------------------------
-   - - -   H e l p e r s   - - -
-   -----------------------------
-*/
-
-function CONCAT_ITERABLE_TO_ARRAY(iterable) {
-  return %concat_iterable_to_array(this, iterable);
-};
-
-
 /* -------------------------------------
    - - -   C o n v e r s i o n s   - - -
    -------------------------------------
 */
 
 // ES5, section 9.12
 function SameValue(x, y) {
   if (typeof x != typeof y) return false;
   if (IS_NUMBER(x)) {
     if (NUMBER_IS_NAN(x) && NUMBER_IS_NAN(y)) return true;
@@ skipping 115 matching lines @@
   to.AddIndexedProperty = AddIndexedProperty;
   to.MaxSimple = MaxSimple;
   to.MinSimple = MinSimple;
   to.SameValue = SameValue;
   to.SameValueZero = SameValueZero;
   to.ToPositiveInteger = ToPositiveInteger;
   to.SpeciesConstructor = SpeciesConstructor;
 });
 
 %InstallToContext([
-  "concat_iterable_to_array_builtin", CONCAT_ITERABLE_TO_ARRAY,
-]);
-
-%InstallToContext([
   "concat_iterable_to_array", ConcatIterableToArray,
 ]);
 
 })