Fix speedup of typedarray-length loading in the ICs as well as Crankshaft

test/mjsunit/regress/regress-typedarray-length.js

Index: test/mjsunit/regress/regress-typedarray-length.js
diff --git a/test/mjsunit/regress/regress-typedarray-length.js b/test/mjsunit/regress/regress-typedarray-length.js
new file mode 100644
index 0000000000000000000000000000000000000000..cae55731f921ced9e26218d1b47631867aa71c30
--- /dev/null
+++ b/test/mjsunit/regress/regress-typedarray-length.js
@@ -0,0 +1,112 @@
+// Copyright 2015 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 a = new Int32Array(100);
+a.__proto__ = null;
+
+function get(a) {
+  return a.length;
+}
+
+assertEquals(undefined, get(a));
+assertEquals(undefined, get(a));
+assertEquals(undefined, get(a));
+%OptimizeFunctionOnNextCall(get);
+assertEquals(undefined, get(a));
+
+get = function(a) {
+  return a.byteLength;
+}
+
+assertEquals(undefined, get(a));
+assertEquals(undefined, get(a));
+assertEquals(undefined, get(a));
+%OptimizeFunctionOnNextCall(get);
+assertEquals(undefined, get(a));
+
+get = function(a) {
+  return a.byteOffset;
+}
+
+assertEquals(undefined, get(a));
+assertEquals(undefined, get(a));
+assertEquals(undefined, get(a));
+%OptimizeFunctionOnNextCall(get);
+assertEquals(undefined, get(a));
+
+(function() {
+  "use strict";
+
+  class MyTypedArray extends Int32Array {
+    get length() {
+      return "length";
+    }
+  }
+
+  a = new MyTypedArray();
+
+  get = function(a) {
+    return a.length;
+  }
+
+  assertEquals("length", get(a));
+  assertEquals("length", get(a));
+  assertEquals("length", get(a));
+  %OptimizeFunctionOnNextCall(get);
+  assertEquals("length", get(a));
+
+  a.__proto__ = null;
+
+  get = function(a) {
+    return a.length;
+  }
+
+  assertEquals(undefined, get(a));
+  assertEquals(undefined, get(a));
+  assertEquals(undefined, get(a));
+  %OptimizeFunctionOnNextCall(get);
+  assertEquals(undefined, get(a));
+})();
+
+// Ensure we cannot delete length, byteOffset, byteLength.
+assertTrue(Int32Array.prototype.hasOwnProperty("length"));
+assertTrue(Int32Array.prototype.hasOwnProperty("byteOffset"));
+assertTrue(Int32Array.prototype.hasOwnProperty("byteLength"));
+assertFalse(delete Int32Array.prototype.length);
+assertFalse(delete Int32Array.prototype.byteOffset);
+assertFalse(delete Int32Array.prototype.byteLength);
+
+a = new Int32Array(100);
+
+get = function(a) {
+  return a.length;
+}
+
+assertEquals(100, get(a));
+assertEquals(100, get(a));
+assertEquals(100, get(a));
+%OptimizeFunctionOnNextCall(get);
+assertEquals(100, get(a));
+
+get = function(a) {
+  return a.byteLength;
+}
+
+assertEquals(400, get(a));
+assertEquals(400, get(a));
+assertEquals(400, get(a));
+%OptimizeFunctionOnNextCall(get);
+assertEquals(400, get(a));
+
+get = function(a) {
+  return a.byteOffset;
+}
+
+assertEquals(0, get(a));
+assertEquals(0, get(a));
+assertEquals(0, get(a));
+%OptimizeFunctionOnNextCall(get);
+assertEquals(0, get(a));