[GHC] #8578: Improvements to SpinLock implementation

[GHC]

#8578: Improvements to SpinLock implementation
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       Reporter:  parcs             |             Owner:  parcs
           Type:  task              |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  Runtime System    |           Version:  7.7
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 The SpinLock implementation has a number of deficiencies. Here is a pair
 of patches that improves its implementation. Let me know what you think.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8578>
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