3.6.1 patch nomination: r233312 - Fix rare case where APInt divide algorithm applied un-needed transformation.

[Paweł Bylica]

Hi Chandler, Yaron & Tom,

r233312:

> Author: yrnkrn
> Date: Thu Mar 26 14:45:19 2015
> New Revision: 233312
>
> URL: http://llvm.org/viewvc/llvm-project?rev=233312&view=rev
> Log:
> Fix rare case where APInt divide algorithm applied un-needed
> transformation.
>
> APInt uses Knuth's D algorithm for long division. In rare cases the
> implementation applied a transformation that was not needed.
>
> Added unit tests for long division. KnuthDiv() procedure is fully covered.
> There is a case in APInt::divide() that I believe is never used (marked
> with
> a comment) as all users of divide() handle trivial cases earlier.
>
> Patch by Pawel Bylica!
>
>   http://reviews.llvm.org/D8448
>
>
> Modified:
>     llvm/trunk/lib/Support/APInt.cpp
>     llvm/trunk/unittests/ADT/APIntTest.cpp
>
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