[PATCH] ComputeKnownBits: be a bit smarter about ADDs

[escha]

I really can't think of anything without going into x86-specific backend hacks (or other larger-scale changes in the constant optimization bits of the backend) :-/

LLVM tries to aggressively shrink constants in the general case, and unfortunately it hurts here... but I imagine it already hurts in a lot of other cases, this optimization just exposes one more.


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  rL LLVM

http://reviews.llvm.org/D10512

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