[PATCH] Reassociate x + -0.1234 * y into x - 0.1234 * y

[Chad Rosier]

Hi Erik,
My suggestions were easier to see in a patch, so see attached. I cleaned
it up a bit then ran it through clang-format.  NFCI.  If you'd like to
add/edit anything, please do.

Upload the revised patch and I'll review and approve.

 Regards,
   Chad

> Rebased on top of r215647.
>
> http://reviews.llvm.org/D4904
>
> Files:
>   lib/Target/README.txt
>   lib/Transforms/Scalar/Reassociate.cpp
>   test/Transforms/Reassociate/liftsign.ll
>


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