Ship ES6 Math functions.

test/mjsunit/es6/math-sign.js

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-// Flags: --harmony-maths
-
 assertEquals("Infinity", String(1/Math.sign(0)));
 assertEquals("-Infinity", String(1/Math.sign(-0)));
 assertEquals(1, Math.sign(100));
 assertEquals(-1, Math.sign(-199));
 assertEquals(1, Math.sign(100.1));
 assertTrue(isNaN(Math.sign("abc")));
 assertTrue(isNaN(Math.sign({})));
 assertEquals(0, Math.sign([]));
 assertEquals(1, Math.sign([1]));
 assertEquals(-1, Math.sign([-100.1]));
 assertTrue(isNaN(Math.sign([1, 1])));
 assertEquals(1, Math.sign({ toString: function() { return "100"; } }));
 assertEquals(1, Math.sign({ toString: function() { return 100; } }));
 assertEquals(-1, Math.sign({ valueOf: function() { return -1.1; } }));
 assertEquals(-1, Math.sign({ valueOf: function() { return "-1.1"; } }));
 assertEquals(-1, Math.sign(-Infinity));
 assertEquals(1, Math.sign(Infinity));
 assertEquals(-1, Math.sign("-Infinity"));
 assertEquals(1, Math.sign("Infinity"));