[builtins] Support SameValue and SameValueZero via runtime functions.

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;
 });
 
 // ----------------------------------------------------------------------------
 
-/* -------------------------------------
-   - - -   C o n v e r s i o n s   - - -
-   -------------------------------------
+
+/* ---------------------------------
+   - - -   U t i l i t i e 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;
-    // x is +0 and y is -0 or vice versa.
-    if (x === 0 && y === 0 && 1/x !== 1/y) {
-      return false;
-    }
-  }
-  if (IS_SIMD_VALUE(x)) return %SimdSameValue(x, y);
-  return x === y;
-}
-
-
-// ES6, section 7.2.4
-function SameValueZero(x, y) {
-  if (typeof x !== typeof y) return false;
-  if (IS_NUMBER(x)) {
-    if (NUMBER_IS_NAN(x) && NUMBER_IS_NAN(y)) return true;
-  }
-  if (IS_SIMD_VALUE(x)) return %SimdSameValueZero(x, y);
-  return x === y;
-}
-
-
 function ConcatIterableToArray(target, iterable) {
    var index = target.length;
    for (var element of iterable) {
      AddIndexedProperty(target, index++, element);
    }
    return target;
 }
 
 
-/* ---------------------------------
-   - - -   U t i l i t i e s   - - -
-   ---------------------------------
-*/
-
-
 // This function should be called rather than %AddElement in contexts where the
 // argument might not be less than 2**32-1. ES2015 ToLength semantics mean that
 // this is a concern at basically all callsites.
 function AddIndexedProperty(obj, index, value) {
   if (index === TO_UINT32(index) && index !== kMaxUint32) {
     %AddElement(obj, index, value);
   } else {
     %AddNamedProperty(obj, TO_STRING(index), value, NONE);
   }
 }
@@ skipping 62 matching lines @@
 // boilerplate gets the right prototype.
 %FunctionSetPrototype(GlobalArray, new GlobalArray(0));
 
 // ----------------------------------------------------------------------------
 // Exports
 
 utils.Export(function(to) {
   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", ConcatIterableToArray,
 ]);
 
 })