Bugfix in inlined versions of Array.indexOf() and Array.lastIndexOf() with a regression test.

test/mjsunit/regress/regress-crbug-381534.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
+
+var obj = {};
+
+function f(v) {
+  var v1 = -(4/3);
+  var v2 = 1;
+  var arr = new Array(+0, true, 0, -0, false, undefined, null, "0", obj, v1, -(4/3), -1.3333333333333, "str", v2, 1, false);
+  assertEquals(10, arr.lastIndexOf(-(4/3)));
+  assertEquals(9, arr.indexOf(-(4/3)));
+
+  assertEquals(10, arr.lastIndexOf(v));
+  assertEquals(9, arr.indexOf(v));
+
+  assertEquals(8, arr.lastIndexOf(obj));
+  assertEquals(8, arr.indexOf(obj));
+}
+
+function g(v, x, index) {
+  var arr = new Array({}, x-1.1, x-2, x-3.1);
+  assertEquals(index, arr.indexOf(0));
+  assertEquals(index, arr.lastIndexOf(0));
+
+  assertEquals(index, arr.indexOf(v));
+  assertEquals(index, arr.lastIndexOf(v));
+}
+
+f(-(4/3));
+f(-(4/3));
+%OptimizeFunctionOnNextCall(f);
+f(-(4/3));
+
+g(0, 2, 2);
+g(0, 3.1, 3);
+%OptimizeFunctionOnNextCall(g);
+g(0, 1.1, 1);