- Take HeapHandle& parameter to allow a use case of free() on an already
  dead object during sweeping.
- Change free() from T* to T& which forces an object and allows the
  caller to place the nullptr check before retrieving a heap handle.

Bug: chromium:1056170
Change-Id: I80689d27d3abe410d177cd8c86b31ff2fe579a77
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2874461
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74387}