[Math] implement Math.random as TFJ builtin.

test/mjsunit/mirror-script.js

Index: test/mjsunit/mirror-script.js
diff --git a/test/mjsunit/mirror-script.js b/test/mjsunit/mirror-script.js
index 635c658ac3c5c905deb5a17ef19bc003357b27cf..74f37f80bb810684864f41cc823c7faba7d991e7 100644
--- a/test/mjsunit/mirror-script.js
+++ b/test/mjsunit/mirror-script.js
@@ -83,7 +83,6 @@ function testScriptMirror(f, file_name, file_lines, type, compilation_type,
 
 
 // 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);