[GHC] #9281: Rewrite `integer-gmp` to use only non-allocating GMP functions

[GHC]

#9281: Rewrite `integer-gmp` to use only non-allocating GMP functions
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        Reporter:  hvr                |            Owner:  hvr
            Type:  task               |           Status:  new
        Priority:  normal             |        Milestone:  7.10.1
       Component:  libraries (other)  |          Version:
      Resolution:                     |         Keywords:  integer-gmp
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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Comment (by ekmett):

 Eliminating the need for the GMP custom allocator would be a _huge_ win
 for interoperability, and would obviate the need for code I've spent
 months writing.

 If you need anything from me just ask.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9281#comment:2>
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