Harmony: fix spec violation in Math.cosh.

test/mjsunit/harmony/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 42 matching lines @@
   test_id(Math.tanh, Math.atanh, -x);
 });
 
 
 [Math.sinh, Math.asinh, Math.tanh, Math.atanh].forEach(function(fun) {
   assertEquals("-Infinity", String(1/fun(-0)));
   assertEquals("Infinity", String(1/fun(0)));
 });
 
 
-[Math.sinh, Math.asinh, Math.cosh].forEach(function(fun) {
+[Math.sinh, Math.asinh].forEach(function(fun) {
   assertEquals("-Infinity", String(fun(-Infinity)));
   assertEquals("Infinity", String(fun(Infinity)));
   assertEquals("-Infinity", String(fun("-Infinity")));
   assertEquals("Infinity", String(fun("Infinity")));
 });
 
 
+assertEquals("Infinity", String(Math.cosh(-Infinity)));
+assertEquals("Infinity", String(Math.cosh(Infinity)));
+assertEquals("Infinity", String(Math.cosh("-Infinity")));
+assertEquals("Infinity", String(Math.cosh("Infinity")));
+
+
 assertEquals("-Infinity", String(Math.atanh(-1)));
 assertEquals("Infinity", String(Math.atanh(1)));
 
 // Math.atanh(x) is NaN for |x| > 1 and NaN
 [1.000000000001, Math.PI, 10000000, 2, Infinity, NaN].forEach(function(x) {
   assertTrue(isNaN(Math.atanh(-x)));
   assertTrue(isNaN(Math.atanh(x)));
 });
 
 
@@ skipping 42 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);
 });