[typedarrays] remove invalid optimization in NAMEConstructor()

test/mjsunit/es6/typedarray.js

Index: test/mjsunit/es6/typedarray.js
diff --git a/test/mjsunit/es6/typedarray.js b/test/mjsunit/es6/typedarray.js
index b1bd8937bea07e0028759b33fa4334043db99bb8..ca68db96c92a486a369dfdea4e55364f69a04433 100644
--- a/test/mjsunit/es6/typedarray.js
+++ b/test/mjsunit/es6/typedarray.js
@@ -334,6 +334,31 @@ function TestTypedArray(constr, elementSize, typicalElement) {
   assertEquals(0, genArr[0]);
   assertEquals(9, genArr[9]);
   assertEquals(1, iteratorReadCount);
+
+  // Modified %ArrayIteratorPrototype%.next() method is honoured (v8:5699)
+  const ArrayIteratorPrototype = Object.getPrototypeOf([][Symbol.iterator]());
+  const ArrayIteratorPrototypeNext = ArrayIteratorPrototype.next;
+  ArrayIteratorPrototype.next = function() {
+    return { done: true };
+  };
+  genArr = new constr([1, 2, 3]);
+  assertEquals(0, genArr.length);
+  ArrayIteratorPrototype.next = ArrayIteratorPrototypeNext;
+
+  // Modified %ArrayIteratorPrototype%.next() during iteration is honoured as
+  // well.
+  genArr = new constr(Object.defineProperty([1, , 3], 1, {
+    get() {
+      ArrayIteratorPrototype.next = function() {
+        return { done: true };
+      }
+      return 2;
+    }
+  }));
+  assertEquals(2, genArr.length);
+  assertEquals(1, genArr[0]);
+  assertEquals(2, genArr[1]);
+  ArrayIteratorPrototype.next = ArrayIteratorPrototypeNext;
 }
 
 TestTypedArray(Uint8Array, 1, 0xFF);