[DynInst_API:] [dyninst/dyninst] 0a4a62: Updates for #780 (#783)

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  Branch: refs/heads/master
  Home:   https://github.com/dyninst/dyninst
  Commit: 0a4a6264d05ee3fb037b8719dc0a84de06026413
      https://github.com/dyninst/dyninst/commit/0a4a6264d05ee3fb037b8719dc0a84de06026413
  Author: Tim Haines <thaines.astro@xxxxxxxxx>
  Date:   2020-07-31 (Fri, 31 Jul 2020)

  Changed paths:
    M dyninstAPI/src/pcEventMuxer.C
    M proccontrol/src/linux.C
    M proccontrol/src/process.C

  Log Message:
  -----------
  Updates for #780 (#783)

* pcEventMuxer: Fix print specifier in debug logging
    This should have been fixed in 6bd68f38b
* Simplify PCEventMailbox::size
* Make PCEventMailbox::find threadsafe
* Whitespace update
* Add more logging for state handling