[sandbox] Decommit empty blocks in the ExternalPointerTable during Sweep
With this CL, blocks at the end of the ExternalPointerTable that are completely empty after sweeping will be decommitted to reduce the table's memory footprint. Bug: v8:10391 Change-Id: I1002e95a0f9c22400fdd2620047d86738a1f7af4 Cq-Include-Trybots: luci.v8.try:v8_linux64_heap_sandbox_dbg_ng,v8_linux_arm64_sim_heap_sandbox_dbg_ng Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3791903Reviewed-by:Igor Sheludko <ishell@chromium.org> Commit-Queue: Samuel Groß <saelo@chromium.org> Cr-Commit-Position: refs/heads/main@{#82085}
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