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`PrintUsageThenExit(code)` was supposed to exit when `code` was not zero, but: - The name didn't reflect that, so it was confusing that `PrintUsageThenExit(0)` would *not* exit. - The implementation in the Base Profiler exited anyway! This caused issues with some legacy code that still used the now-removed "threads" feature. This patch renames the function to just `PrintUsage()` and never exits, leaving the caller to invoke `exit(code)` as needed -- with the added benefit that it's possible to exit with a zero code, useful in cases where an exit is not actually an error. Differential Revision: https://phabricator.services.mozilla.com/D135666