[PATCH] Strength reduce intrinsics with overflow into regular arithmetic operations if possible.

[Erik Eckstein]

Michael,

I updated the comments.

> I think it is good to have the Hacker's Delight mention, but IIRC LLVM has some specific rules about this.


I changed it to the style of other references in the llvm sources.


http://reviews.llvm.org/D6477

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