Internal fields are used for implementing edges to C++ objects in
Oilpan. When setting the fields on a JS API object, we should also
emit a write barrier for this edge.

This mechanism replaces the explicit write barrier in V8's API which
is provided through `JSHeapConsistency::*`.

The internal barrier should also be slightly faster as it doesn't
require any API calls.

Bug: v8:12356
Change-Id: I639d18141acfb910d0ded8d987d8a0916e25431d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3257709
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77749}