[builtins] Support SameValue and SameValueZero via runtime functions.

src/js/runtime.js

Index: src/js/runtime.js
diff --git a/src/js/runtime.js b/src/js/runtime.js
index eeb887aff4cba2c110cfbe1eddf246e0a1f48db1..7a61094da62d4bcd07b10d4a0ebb12fa7a0d809f 100644
--- a/src/js/runtime.js
+++ b/src/js/runtime.js
@@ -36,36 +36,11 @@ utils.ImportFromExperimental(function(from) {
 
 // ----------------------------------------------------------------------------
 
-/* -------------------------------------
-   - - -   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;
-    // 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;
-}
 
+/* ---------------------------------
+   - - -   U t i l i t i e s   - - -
+   ---------------------------------
+*/
 
 function ConcatIterableToArray(target, iterable) {
    var index = target.length;
@@ -76,12 +51,6 @@ function ConcatIterableToArray(target, iterable) {
 }
 
 
-/* ---------------------------------
-   - - -   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.
@@ -164,8 +133,6 @@ 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;
 });