[builtins] Migrate Math.abs() to TurboFan builtins.

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 7e3891a9f75285b41acca7953b52bea476dde6da..635c658ac3c5c905deb5a17ef19bc003357b27cf 100644
--- a/test/mjsunit/mirror-script.js
+++ b/test/mjsunit/mirror-script.js
@@ -84,6 +84,6 @@ 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.abs, 'native math.js', -1, 0, 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);