Remove TODO around now-merged upstream TA#with spec PR

Bug: v8:12764
Change-Id: I4f4d2775045878576227463f27ded769c3cef362
No-try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3691797
Auto-Submit: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80982}

src/builtins/typed-array-with.tq

@@ -21,8 +21,6 @@ transitioning javascript builtin TypedArrayPrototypeWith(
         otherwise IsDetachedOrOutOfBounds;
     const originalLength = attachedArrayAndLength.length;
 
-    // TODO(v8:12764): This change is waiting on upstream
-    // https://github.com/tc39/proposal-change-array-by-copy/issues/85
     if (IsBigInt64ElementsKind(array.elements_kind)) {
       // 4. If O.[[ContentType]] is BigInt, set value to ? ToBigInt(value).
       value = ToBigInt(context, value);