This is another step towards improving TSAN and test coverage of
concurrent paths.

By purging reconstructible (background-serialized or never-serialized)
ObjectData instances from the cache after serialization, we increase
ObjectData-construction activity on the background thread.

Note that this means ObjectData is no longer canonicalized - two
instances can point at the same underlying object. Losing this
property is unfortunate, but we can revert back to it once work on the
concurrency project is further advanced.

Bug: v8:7790
Change-Id: I44b1366f61dc9087cddc76939512abed17e28d61
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2844661
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74221}