Preserve Smi representation of non-escaping fields.

test/mjsunit/regress/regress-escape-preserve-smi-representation.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.
+
+// Flags: --allow-natives-syntax
+
+function deepEquals(a, b) {
+  if (a === b) { if (a === 0) return (1 / a) === (1 / b); return true; }
+  if (typeof a != typeof b) return false;
+  if (typeof a == "number") return isNaN(a) && isNaN(b);
+  if (typeof a !== "object" && typeof a !== "function") return false;
+  if (objectClass === "RegExp") { return (a.toString() === b.toString()); }
+  if (objectClass === "Function") return false;
+  if (objectClass === "Array") {
+    var elementCount = 0;
+    if (a.length != b.length) { return false; }
+    for (var i = 0; i < a.length; i++) {
+      if (!deepEquals(a[i], b[i])) return false;
+    }
+    return true;
+  }
+}
+
+
+function __f_1(){
+ var __v_0 = [];
+ for(var i=0; i<2; i++){
+   var __v_1=[];
+   __v_0.push([])
+   deepEquals(2, __v_0.length);
+ }
+}
+__f_1();
+%OptimizeFunctionOnNextCall(__f_1);
+__f_1();