Original commit message:
[api] add Isolate::Deinitialize() and Isolate::Free()
This allows embedders to mirror the isolate disposal routine
with an initialization routine that uses Isolate::Allocate().
```
v8::Isolate* isolate = v8::Isolate::Allocate();
// Use the isolate address as a key.
v8::Isolate::Initialize(isolate, params);
isolate->Deinitialize();
// Remove the entry keyed by isolate address.
v8::Isolate::Free(isolate);
```
Previously, the only way to dispose the isolate bundles the
de-initialization and the freeing of the address together in
v8::Isolate::Dispose(). This is inadequate for embedders like
Node.js that uses the isolate address as a key to manage the
task runner associated with it, if another thread gets an
isolate allocated at the aligned address before the other
thread finishes cleanup for the isolate previously allocated
at the same address, and locking on the entire disposal can
be too risky since it may post GC tasks that in turn requires
using the isolate address to locate the task runner. It's a
lot simpler to handle the issue if the disposal process of
the isolate can mirror the initialization of it and split
into two routines.
Refs: https://github.com/nodejs/node/pull/57753#issuecomment-2818999420
Refs: https://github.com/nodejs/node/issues/30850
Bug: 412943769
Change-Id: I3865c27395aded3a6f32de74d96d0698b2d891b9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/6480071
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Joyee Cheung <joyee@igalia.com>
Cr-Commit-Position: refs/heads/main@{#99890}
Refs: 954187bb1b
PR-URL: https://github.com/nodejs/node/pull/58070
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
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