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[LICM] Hoisting of widenable conditions out of loops

Authored by reames on Nov 8 2019, 7:00 AM.

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[LICM] Hoisting of widenable conditions out of loops

The change itself is straight forward and obvious, but ... there's an existing test checking for exactly the opposite. Both I and Artur think this is simply conservatism in the initial implementation. If anyone bisects a problem to this, a counter example will be very interesting.

Differential Revision: https://reviews.llvm.org/D69907

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