[GHC] #8704: Use GHC.Exts.build in randoms, randomRs to achieve fusion

[GHC]

#8704: Use GHC.Exts.build in randoms, randomRs to achieve fusion
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        Reporter:  ion1              |            Owner:
            Type:  feature request   |           Status:  patch
        Priority:  normal            |        Milestone:
       Component:  libraries/random  |          Version:  7.6.3
      Resolution:                    |         Keywords:  fusion
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:  #4218
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Comment (by nomeata):

 Thanks. From my POV it is worth adding even if you can’t measure a
 performance gain; it is still good to know that nice code is being
 generated. But of course it is up to Ryan Newton (random maintainer) to
 decide this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8704#comment:4>
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