Introduce a LeakyObject template and use that to implement static
lazily initialized objects that never get destructed. This was done in a
hand-crafted and complex way before via LazyInstance and
LazyStaticInstance.

R=tebbi@chromium.org

Bug: v8:8600, v8:8562
Change-Id: Id160996753b2cb1baf0f4b2cec9e1727f1d01512
Reviewed-on: https://chromium-review.googlesource.com/c/1388539
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58494}