[GHC] #8647: Reduce allocations in `integer-gmp`

[GHC]

#8647: Reduce allocations in `integer-gmp`
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        Reporter:  hvr                      |            Owner:
            Type:  task                     |           Status:  patch
        Priority:  normal                   |        Milestone:  7.8.1
       Component:  libraries (other)        |          Version:  7.6.3
      Resolution:                           |         Keywords:  integer-
Operating System:  Unknown/Multiple         |  gmp
 Type of failure:  Runtime performance bug  |     Architecture:  x86_64
       Test Case:                           |  (amd64)
        Blocking:                           |       Difficulty:  Unknown
                                            |       Blocked By:
                                            |  Related Tickets:  #8638
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Comment (by Herbert Valerio Riedel <hvr@…>):

 In [changeset:"a3878d172b358b896b3c8302e58199958479d8e5/integer-gmp"]:
 {{{
 #!CommitTicketReference repository="integer-gmp"
 revision="a3878d172b358b896b3c8302e58199958479d8e5"
 Temporary disable `mpz_gmpz_tdiv_qr_ui` to workaround #8661

 I still need to investigated, but for some reason not yet obvious to me,
 commit [af2ba9c8/integer-gmp] (re #8647) seems to have triggered #8661
 on linux/32

 This commit disables the use of the `quotRemIntegerWord#` primop on
 32bit (which seems to trigger the issue).

 Signed-off-by: Herbert Valerio Riedel <hvr at gnu.org>
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8647#comment:10>
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