[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:  patch
              Priority:  normal      |        Milestone:  7.10.1
             Component:  Core        |          Version:
  Libraries                          |         Keywords:  integer-gmp
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:  #8647
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:  Phab:D82    |
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Comment (by Herbert Valerio Riedel <hvr@…>):

 In [changeset:"63a9d9387f27e5842bed5946c5f1381f209d2918/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="63a9d9387f27e5842bed5946c5f1381f209d2918"
 Fix `integer-gmp2` compilation with GMP 4.x (#9281)

 GMP 4.x didn't provide the `mp_bitcnt_t` typedef yet, so we locally
 define one if GMP 4.x is detected.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9281#comment:17>
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