Harmony: fix spec violation in Math.cosh.

test/mjsunit/harmony/math-hyperbolic.js

Index: test/mjsunit/harmony/math-hyperbolic.js
diff --git a/test/mjsunit/harmony/math-hyperbolic.js b/test/mjsunit/harmony/math-hyperbolic.js
index 604448d89add4ab49ebfe004cf01912e4b65a0bd..c45a19c526db3315a7d52fb521940ae3ba59e710 100644
--- a/test/mjsunit/harmony/math-hyperbolic.js
+++ b/test/mjsunit/harmony/math-hyperbolic.js
@@ -60,7 +60,7 @@ function test_id(fun, rev, value) {
 });
 
 
-[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")));
@@ -68,6 +68,12 @@ function test_id(fun, rev, value) {
 });
 
 
+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)));