RT: adaptive-lock enhancements

Hi Ingo, Steven, Thomas,
  The following series are the scraps from adaptive-locks-v3 that have not yet
  been pulled into RT.  This series applies to 25.4-rt2.

  For the most part, this is the difference between adaptive-v3 and whats in
  the upstream tree, with the following exceptions:

  1) I have fixed an issue in the "optimize-wakeup" patch that went out in v3.
     There was a hunk left-over from when we applied adaptive to both spinlocks
     and mutexes.  We have since dropped mutexes, so that patch needed to be
     refactored to be correct.

  2) I have (for now) dropped the timeout feature.  It needs to be re-worked to
     apply to the current version of adaptive-locks that are in the tree.

  I also moved what was patch 6/8 in v3 to be first, because I believe it has
  the most potential of all the other patches to improve performance.

  I have performed some baseline analysis of these patches compared to
  25.4-rt2, which you can find here:

    ftp://ftp.novell.com/dev/ghaskins/25.4-rt2-adaptive-enhan...

  I only did hackbench runs for this round of testing, but you can see there is
  a small, but net-positive gain in the results.  I think the results are more
  profound for other benchmarks, but I didnt have the time to re-run them all
  yet.

  As always, comments/questions welcome.

  Regards,
   -Greg
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