[GHC] #10678: integer-gmp's runS seems unnecessarily expensive

[GHC]

#10678: integer-gmp's runS seems unnecessarily expensive
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        Reporter:  rwbarton          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
  (CodeGen)                          |
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by rwbarton):

 I note that bytestring and text have the same issue (using
 `unsafeDupablePerformIO` and `runSTRep` respectively in the role of
 `runS`) so this may be a known problem.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10678#comment:1>
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