Fixed constant folding in HMod.

test/mjsunit/constant-folding-2.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 238 matching lines @@
   assertEquals("NaN", String("abc".charCodeAt(4.1)));
 });
 
 test(function stringCharAt() {
   assertEquals("c", "abc".charAt(2));
   assertEquals("", "abc".charAt(-1));
   assertEquals("", "abc".charAt(4));
   assertEquals("b", "abc".charAt(1.1));
   assertEquals("", "abc".charAt(4.1));
 });
+
+
+test(function int32Mod() {
+  assertEquals(-0, -2147483648 % (-1));
+});
+
+test(function int32Div() {
+  assertEquals(2147483648, -2147483648 / (-1));
+});