[GHC] #8789: includes/stg/SMP.h: use 'NOSMP' instead of never defined 'WITHSMP'

[GHC]

#8789: includes/stg/SMP.h: use 'NOSMP' instead of never defined 'WITHSMP'
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        Reporter:  slyfox            |                   Owner:
            Type:  bug               |  thoughtpolice
        Priority:  high              |                  Status:  closed
       Component:  Compiler          |               Milestone:  7.10.1
      Resolution:  fixed             |                 Version:  7.6.3
Operating System:  Unknown/Multiple  |                Keywords:
 Type of failure:  None/Unknown      |            Architecture:
      Blocked By:                    |  Unknown/Multiple
 Related Tickets:                    |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
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Comment (by rwbarton):

 Yes, it's definitely the cause. Effectively this change turned the
 behavior for architectures that don't have a specific memory barrier
 implementation from "do nothing and hope for the best" to "raise a
 compile-time error".

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8789#comment:6>
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