This is a reland of 30c6bd45

Original change's description:
> [weakrefs] Ship WeakRef and FinalizationRegistry.
> 
> I2S: https://groups.google.com/a/chromium.org/g/blink-dev/c/L04PqDk9eMU
> Bug: v8:8179
> Change-Id: I52aaa62cdab981b802fa4a986d60421ef6efcfbb
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2158371
> Commit-Queue: Shu-yu Guo <syg@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#67295}

Bug: v8:8179
Change-Id: If132d88b5a8dbe06ba7a8f80f19f33d9553ca62f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2160017Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67324}