This adds a global counter for the various reasons we might fail to
attribute a tick.

The counters are cleared and printed when Profile::Print() is called,
which we call in our tests, so flaky test output will now contain these
stats along with the printed profile tree.

Drive-by cleanup some print functions and make them const.

Change-Id: Ia3a27405f5b5346adfdbb32afc7e414857969cc5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1550406
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69647}