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a698d3528e
For the cases of two clobbering loads and one loaded object is fully contained in the second `BasicAAResult::aliasGEP` returns just `PartialAlias` that is actually more common case of partial overlap, it doesn't say anything about actual overlapping sizes. AA users such as GVN and DSE have no functionality to estimate aliasing of GEPs with non-constant offsets. The change stores estimated relative offsets so they can be used further. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D93529
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