This includes two fixes

 - Bring back context level recursive protection in ring buffer.
   The simpler counter protection failed, due to a path when
   tracing with trace_clock_global() as it could not be reentrant
   and depended on the ring buffer recursive protection to keep that
   from happening.

 - Prevent branch profiling when FORTIFY_SOURCE is enabled. It causes
   50 - 60 MB in warning messages. Branch profiling should never be
   run on production systems, so there's no reason that it needs to
   be enabled with FORTIFY_SOURCE.
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