[GHC] #14037: Fix fusion for GHC's utility functions

[GHC]

#14037: Fix fusion for GHC's utility functions
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        Reporter:  goldfire          |                Owner:  rockbmb
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.3
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 There is nothing that tests these functions in isolation although it's
 possible improvements would be reflected in the compiler allocations
 measured by the Nofib suite.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14037#comment:5>
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