This reverts commit 6755b956.

Reason for revert: Causing test failures on gc-stress bot:

https://logs.chromium.org/logs/v8/buildbucket/cr-buildbucket.appspot.com/8940015537308234128/+/steps/Mjsunit_-_slow_path/0/logs/array-multiple-receiv../0

Original change's description:
> [in-place weak refs] Use WeakArrayList in Heap::noscript_list.
> 
> BUG=v8:7308
> 
> Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
> Change-Id: Ia53233a3a0ba13b8019f2fda4bc4876ebf4feb76
> Reviewed-on: https://chromium-review.googlesource.com/1149367
> Commit-Queue: Marja Hölttä <marja@chromium.org>
> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#54700}

TBR=marja@chromium.org,mlippautz@chromium.org

Change-Id: I5e9b916a910b812c3cb50be18416c9e9e8ac7b24
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7308
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/1150125Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54701}