Revert removal of TypedArray constructor optimization

When the TypedArray iterator constructor code path was added, a technically
incorrect optimization was added which uses the arraylike code path on array
arguments, even though the %ArrayIterator% could have been monkey-patched
to give different behavior. A previous patch removed this optimization, and
this patch restores it due to the huge performance regression that resulted.

The optimization was previously removed in
https://codereview.chromium.org/1767893002

BUG=chromium:593644
R=adamk
LOG=Y

Review URL: https://codereview.chromium.org/1779373002

Cr-Commit-Position: refs/heads/master@{#34697}

src/js/typedarray.js

@@ -270,7 +270,7 @@ function NAMEConstructor(arg1, arg2, arg3) {
       NAMEConstructByTypedArray(this, arg1);
     } else {
       var iteratorFn = arg1[iteratorSymbol];
-      if (IS_UNDEFINED(iteratorFn)) {
+      if (IS_UNDEFINED(iteratorFn) || iteratorFn === ArrayValues) {
         NAMEConstructByArrayLike(this, arg1, arg1.length);
       } else {
         NAMEConstructByIterable(this, arg1, iteratorFn);