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thread_watcher_report_hang.cc has various unique functions which are
designed to be on the call stack when hangs are reported. Guaranteeing
this requires making all of the functions unique and inhibiting tail
calls. The tail call inhibiting was only applied to two of the functions
so this change applies it to the other two (commented out in one of
them) and adds the NOT_TAIL_CALLED attribute to the function they all
call. This attribute makes the ordering in the functions irrelevant but
there is no cost to having belt and suspenders, so why not?

This completes the work of crrev.com/c/1373878.

Bug: 905288, 1032679
Change-Id: I383cc3453ab2f506017de1143bc8f3666ed38a47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443891Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813393}