Classes: Add basic support for properties

src/math.js

Index: src/math.js
diff --git a/src/math.js b/src/math.js
index f06249d2521fc8447b7eda8aab8b1b171c2b0cd8..860b62f63e50d771625a76b0c5d411b84097085d 100644
--- a/src/math.js
+++ b/src/math.js
@@ -144,7 +144,7 @@ function MathPow(x, y) {
 // ECMA 262 - 15.8.2.14
 var rngstate;  // Initialized to a Uint32Array during genesis.
 function MathRandom() {
-  var r0 = (MathImul(18273, rngstate[0] & 0xFFFF) + (rngstate[0] >>> 16)) | 0;
+  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;
@@ -321,6 +321,8 @@ function SetUpMath() {
   %AddNamedProperty(global, "Math", $Math, DONT_ENUM);
   %FunctionSetInstanceClassName(MathConstructor, 'Math');
 
+  %AddNamedProperty($Math, symbolToStringTag, "Math", READ_ONLY | DONT_ENUM);
+
   // Set up math constants.
   InstallConstants($Math, $Array(
     // ECMA-262, section 15.8.1.1.