Harmony: move math features to es-staging.

test/mjsunit/es6/math-hyperbolic.js

 // Copyright 2013 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 118 matching lines @@
 assertEqualsDelta(-0.5493061443341, Math.atanh(-0.5), 1E-12);
 assertEqualsDelta(-0.1003353477311, Math.atanh(-0.1), 1E-12);
 
 [0, 1E-50, 1E-10, 1E10, 1E50, 1E100, 1E150].forEach(function(x) {
   assertEqualsDelta(Math.asinh(x), -Math.asinh(-x), 1E-12);
 });
 
 [1-(1E-16), 0, 1E-10, 1E-50].forEach(function(x) {
   assertEqualsDelta(Math.atanh(x), -Math.atanh(-x), 1E-12);
 });