Add roundsd instruction to ia32 and use it in optimized Math.floor.

test/mjsunit/math-floor.js

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 // Flags: --max-new-space-size=256 --allow-natives-syntax
 
+var test_id = 0;
+
 function testFloor(expect, input) {
-  function test(n) {
-    return Math.floor(n);
-  }
+  var test = new Function('n',
+                          '"' + (test_id++) + '";return Math.floor(n)');
   assertEquals(expect, test(input));
   assertEquals(expect, test(input));
   assertEquals(expect, test(input));
   %OptimizeFunctionOnNextCall(test);
   assertEquals(expect, test(input));
 }
 
 function zero() {
   var x = 0.5;
   return (function() { return x - 0.5; })();
@@ skipping 105 matching lines @@
   while (--i > 0) {
     ret += Math.floor(n);
   }
   return ret;
 }
 assertEquals(-0, floorsum(1, -0));
 %OptimizeFunctionOnNextCall(floorsum);
 // The optimized function will deopt.  Run it with enough iterations to try
 // to optimize via OSR (triggering the bug).
 assertEquals(-0, floorsum(100000, -0));