[PATCH] [IR] Fix the definition of 'shl nsw'

[Chandler Carruth]

FWIW, I really liked having a definition explicit in terms of what kinds of bits can be shifted out. I think its good to *both* define this from first principles of where bits move in the shift operation, *and* how it should relate to an NSW multiply by a power of two.

Unsure when after when we chatted this wording went away, but I'd really like to keep it.


http://reviews.llvm.org/D8890

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