This was needed for Perfetto at one point but now this is all handled
internally by the Perfetto Client API. The implementation was
potentially wrong as on some platforms we truncate the the thread ID
https://chromium-review.googlesource.com/c/v8/v8/+/1720821/1/src/base/platform/platform-posix.cc#528

Change-Id: I5124f4fb0df4d29ff78ab6c7a2c2b0c9a66a2af3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1981508Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65576}