[Math] implement Math.random as TFJ builtin.

test/mjsunit/mirror-script.js

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 65 matching lines @@
   assertEquals(0, fromJSON.columnOffset);
   if (file_lines > 0) {
     assertEquals(file_lines, fromJSON.lineCount);
   }
   assertEquals(type, fromJSON.scriptType);
   assertEquals(compilation_type, fromJSON.compilationType);
 }
 
 
 // Test the script mirror for different functions.
-testScriptMirror(function(){}, 'mirror-script.js', 90, 2, 0);
-testScriptMirror(Math.random, 'native math.js', -1, 0, 0);
-testScriptMirror(eval('(function(){})'), null, 1, 2, 1, '(function(){})', 87);
-testScriptMirror(eval('(function(){\n  })'), null, 2, 2, 1, '(function(){\n  })', 88);
+testScriptMirror(function(){}, 'mirror-script.js', 89, 2, 0);
+testScriptMirror(eval('(function(){})'), null, 1, 2, 1, '(function(){})', 86);
+testScriptMirror(eval('(function(){\n  })'), null, 2, 2, 1, '(function(){\n  })', 87);