Nikita Popov bb939ebfd7
[BasicAA] Handle known non-zero variable index ...
BasicAA currently handles cases like Scale*V0 + (-Scale)*V1 where
V0 != V1, but does not handle the simpler case of Scale*V with
V != 0. Add it based on an isKnownNonZero() call.
I'm not passing a context instruction for now, because the existing
approach of always using GEP1 for context could result in symmetry
issues.
Differential Revision: https://reviews.llvm.org/D93162
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