Add more tests to mul-exhaustive for constant left/right parameters.

test/mjsunit/str-to-num.js

 // Copyright 2008 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 172 matching lines @@
 assertEquals(0, toNumber("00"));
 assertEquals(1, toNumber("01"));
 assertEquals(2, toNumber("02"));
 assertEquals(10, toNumber("010"));
 assertEquals(100, toNumber("0100"));
 assertEquals(100, toNumber("000100"));
 
 assertEquals(Infinity,  toNumber("1e999"), "1e999");
 assertEquals(-Infinity, toNumber("-1e999"));
 assertEquals(0,         toNumber("1e-999"));
-assertEquals(0,         toNumber("-1e-999"));
+assertEquals(-0,        toNumber("-1e-999"));
 assertEquals(Infinity,  1 / toNumber("1e-999"), "1e-999");
 assertEquals(-Infinity, 1 / toNumber("-1e-999"));
 
 assertTrue(isNaN(toNumber("junk")), "junk");
 assertTrue(isNaN(toNumber("100 junk")), "100 junk");
 assertTrue(isNaN(toNumber("0x100 junk")), "0x100 junk");
 assertTrue(isNaN(toNumber("100.0 junk")), "100.0 junk");
 assertTrue(isNaN(toNumber(".1e4 junk")), ".1e4 junk");
 assertTrue(isNaN(toNumber("Infinity junk")), "Infinity junk");
 assertTrue(isNaN(toNumber("1e")), "1e");
 assertTrue(isNaN(toNumber("1e ")), "1e_");
 assertTrue(isNaN(toNumber("1" + repeat('0', 1000) + 'junk')), "1e1000 junk");
 
 for (var i = 1; i < 12; i++) {
   assertEquals(toNumber('1' + repeat('0', i)), Math.pow(10.0, i));
 }