[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:"a9a0dd34dcdfb7309f57bda88435acca14ec54d5/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="a9a0dd34dcdfb7309f57bda88435acca14ec54d5"
 Install `ghc-gmp.h` C include header file (#9281)

 This is mostly interesting when using the in-tree GMP, as there's
 no way otherwise to access the in-tree `gmp.h` header file after
 installation.

 In case `integer-gmp2` was build against a system-installed GMP library,
 `ghc-gmp.h` simply contains `#include <gmp.h>` for convenience.

 Reviewed By: ekmett

 Differential Revision: https://phabricator.haskell.org/D522
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9281#comment:21>
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