Revert "[Heap] Allocate descriptor array in young"

This reverts commit 0d6aa842.

Reason for revert: Suspected to be triggering many test flakes - https://crbug.com/1005723

Original change's description:
> [Heap] Allocate descriptor array in young
>
> This hopefully fix the regression test from c693e005
>
> Bug: v8:1004766
> Change-Id: If3c554070af6b795e4b3f99cd592a62453028874
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809363
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Commit-Queue: Victor Gomes <victorgomes@google.com>
> Cr-Commit-Position: refs/heads/master@{#63858}

TBR=ulan@chromium.org,victorgomes@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: chromium:1004766, chromium:1005723
Change-Id: I763036ea6873b4b95783981e9e9f4e79782e7a4b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1816515
Commit-Queue: Adam Klein <adamk@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63915}

src/heap/factory.cc

@@ -1843,7 +1843,7 @@ Handle<DescriptorArray> Factory::NewDescriptorArray(int number_of_descriptors,
   DCHECK_LT(0, number_of_all_descriptors);
   int size = DescriptorArray::SizeFor(number_of_all_descriptors);
   HeapObject obj = isolate()->heap()->AllocateRawWith<Heap::kRetryOrFail>(
-      size, AllocationType::kYoung);
+      size, AllocationType::kOld);
   obj.set_map_after_allocation(*descriptor_array_map(), SKIP_WRITE_BARRIER);
   DescriptorArray array = DescriptorArray::cast(obj);
   array.Initialize(*empty_enum_cache(), *undefined_value(),