Use a private own symbol instead of a hidden property for hash codes

src/math.js

Index: src/math.js
diff --git a/src/math.js b/src/math.js
index 633a5d02c45d37ef830afbb221c8e5fc5138e08c..95796c636782d53f9ac6c67a2436e4ea88ae3cfd 100644
--- a/src/math.js
+++ b/src/math.js
@@ -9,6 +9,7 @@ var $exp;
 var $floor;
 var $max;
 var $min;
+var $intrandom;
 
 (function(global, shared, exports) {
 
@@ -144,6 +145,15 @@ function MathRandom() {
   return (x < 0 ? (x + 0x100000000) : x) * 2.3283064365386962890625e-10;
 }
 
+function MathRandomRaw() {
+  var r0 = (MathImul(18030, rngstate[0] & 0xFFFF) + (rngstate[0] >>> 16)) | 0;
+  rngstate[0] = r0;
+  var r1 = (MathImul(36969, rngstate[1] & 0xFFFF) + (rngstate[1] >>> 16)) | 0;
+  rngstate[1] = r1;
+  var x = ((r0 << 16) + (r1 & 0xFFFF)) | 0;
+  return x & 0x3fffffff;
+}
+
 // ECMA 262 - 15.8.2.15
 function MathRound(x) {
   return %RoundNumber(TO_NUMBER_INLINE(x));
@@ -361,6 +371,7 @@ $installFunctions(Math, DONT_ENUM, [
 $abs = MathAbs;
 $exp = MathExp;
 $floor = MathFloorJS;
+$intrandom = MathRandomRaw;
 $max = MathMax;
 $min = MathMin;