These are used by unittests which can be compiled as a separate binary
that links againt libv8.

Bug: chromium:1218005
Change-Id: Ibb29c4fa104be61fc26cbd6c1b349d74d74c50a6
Cq-Include-Trybots: luci.v8.try:v8_linux64_heap_sandbox_dbg_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3202002
Commit-Queue: Samuel Groß <saelo@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77228}