Add %TypedArray% to proto chain

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
index cae55731f921ced9e26218d1b47631867aa71c30..62acb7db562f41687bbcfdd5046513618ac2ad27 100644
--- a/test/mjsunit/regress/regress-typedarray-length.js
+++ b/test/mjsunit/regress/regress-typedarray-length.js
@@ -71,14 +71,6 @@ assertEquals(undefined, get(a));
   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) {
@@ -110,3 +102,13 @@ assertEquals(0, get(a));
 assertEquals(0, get(a));
 %OptimizeFunctionOnNextCall(get);
 assertEquals(0, get(a));
+
+// Ensure we can delete length, byteOffset, byteLength.
+for (var name of ['length', 'byteOffset', 'byteLength', 'buffer']) {
+  var property = Object.getOwnPropertyDescriptor(
+                     Int32Array.prototype.__proto__, name);
+  assertEquals("object", typeof property);
+  assertEquals(true, property.configurable);
+  assertEquals(false, property.enumerable);
+  assertEquals("function", typeof property.get);
+}