deps: don't busy loop in v8 cpu profiler thread

Backport 6964a9e0685fa186d9d9b7907be17505e839db1a from upstream v8.

Original commit message:

  Make CPU profiler do not hog 100% of CPU.

  Tick event processor should not stay in a tight loop
  when there's nothing to do. It can go sleep until next sample event.

  LOG=N
  BUG=v8:3967
  Committed: https://crrev.com/6964a9e0685fa186d9d9b7907be17505e839db1a
  Cr-Commit-Position: refs/heads/master@{#28211}

Fixes #25137
Related: #9439, #8789

PR: #25268
PR-URL: https://github.com/joyent/node/pull/25268


Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Julien Gilli <jgilli@fastmail.fm>