[tracing] Replace semaphores with {Start,Stop}Blocking
Use Perfetto's Start/StopBlocking() helpers instead of bespoke synchronization with semaphores. Cq-Include-Trybots: luci.v8.try:v8_linux64_perfetto_dbg_ng Bug: v8:8339 Change-Id: If8266d5fa5e3ff6403b9b2e539ec985bc67fcc90 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1728623 Commit-Queue: Sami Kyöstilä <skyostil@chromium.org> Commit-Queue: Peter Marshall <petermarshall@chromium.org> Reviewed-by: Peter Marshall <petermarshall@chromium.org> Auto-Submit: Sami Kyöstilä <skyostil@chromium.org> Cr-Commit-Position: refs/heads/master@{#63102}
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