[turbofan] Fix recognition of Uint32Div in simplified lowering.

test/mjsunit/asm/uint32div.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var stdlib = {};
 var foreign = {};
 var heap = new ArrayBuffer(64 * 1024);
 
 function Uint32Div(divisor) {
   var name = "div_";
   name += divisor;
   var m = eval("function Module(stdlib, foreign, heap) {\n"
       + " \"use asm\";\n"
       + " function " + name + "(dividend) {\n"
       + "  return ((dividend >>> 0) / " + divisor + ") >>> 0;\n"
       + " }\n"
       + " return { f: " + name + "}\n"
       + "}; Module");
   return m(stdlib, foreign, heap).f;
 }
 
 var divisors = [0, 1, 3, 4, 10, 42, 64, 100, 1024, 2147483647, 4294967295];
 for (var i in divisors) {
   var divisor = divisors[i];
-  var mod = Uint32Div(divisor);
+  var div = Uint32Div(divisor);
   for (var dividend = 0; dividend < 4294967296; dividend += 3999773) {
-    assertEquals((dividend / divisor) >>> 0, mod(dividend));
+    assertEquals((dividend / divisor) >>> 0, div(dividend));
   }
 }
+
+var div = (function(stdlib, foreign, heap) {
+  "use asm";
+  function div(dividend, divisor) {
+    return (dividend >>> 0) / (divisor >>> 0) | 0;
+  }
+  return {div: div};
+})(stdlib, foreign, heap).div;
+
+for (var i in divisors) {
+  var divisor =  divisors[i];
+  for (var dividend = 0; dividend < 4294967296; dividend += 3999773) {
+    assertEquals((dividend >>> 0) / (divisor >>> 0) | 0,
+                 div(dividend, divisor));
+  }
+}