Changes to integer-gmp(2)

Changes to integer-gmp:
commit 8bf9541912c30ffb740d6ab67edcadcfbe4fc80b
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Fri Jan 3 22:36:04 2014 +0100

    Add new `mpz_{sub,add}_ui`-based primop (re #8647)

    This adds `{plus,minus}IntegerInt#` which help to reduce temporary
    allocations in `plusInteger` and `minusInteger`.

    This and the previous commit introducing `timesIntegerInt#` (i.e. baeeef7af6e)
    result in reduced allocations for the following nofib benchmarks on Linux/amd64:

             Program      Size    Allocs   Runtime   Elapsed  TotalMem
      ------------------------------------------------------------------
          bernouilli     +0.0%     -4.2%      0.12      0.12     +0.0%
               kahan     +0.1%    -12.6%      0.17      0.17     +0.0%
            pidigits     +0.0%     -0.5%     -4.7%     -4.5%     +0.0%
               power     +0.0%     -2.7%     +3.1%     +3.1%     +9.1%
           primetest     +0.0%     -4.2%      0.07      0.07     +0.0%
                 rsa     +0.0%     -4.1%      0.02      0.02     +0.0%
                 scs     +0.0%     -2.6%     -0.8%     -0.7%     +0.0%
      ------------------------------------------------------------------
                 Min     +0.0%    -12.6%     -4.7%     -4.5%     -5.0%
                 Max     +0.1%     +0.2%     +3.1%     +3.1%     +9.1%
      Geometric Mean     +0.1%     -0.3%     -0.0%     +0.0%     +0.1%
      ------------------------------------------------------------------

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

commit baeeef7af6e37441d1fa28f4197a8cb878a9ef0b
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Thu Jan 2 09:31:50 2014 +0100

    Add new `mpz_mul_si`-based primop (re #8647)

    This primop helps reducing allocation by being able to pass one `S#`
    argument directly to the GMP multiplication primitive without needing to
    promote (and thus allocate a `ByteArray#` as well) the `J#` first.

    This benefits a few nofib benchmarks wrt to allocations (having most
    impact on `kahan` resulting in about 10% less allocations)

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