Fix AxisInfo handling of PoisonOp producing MemDesc (#8489) #5501
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AxisInfo analysis currently retrieves the rank from any `ShapedType` producing `PoisonOp`. This is a problem if the `PoisonOp` actually produces a `MemDesc`, since the value produced by the `PoisonOp` may flow into the same value as some other `MemDesc` producing operation, which will have been assigned the "pessimistic state" and have rank 1. When we attempt to join the two, the ranks will not match, potentially resulting in a crash. # New contributor declaration - [x] I am not making a trivial change, such as fixing a typo in a comment. - [x] I have written a PR description following these [rules](https://cbea.ms/git-commit/#why-not-how). - [x] I have run `pre-commit run --from-ref origin/main --to-ref HEAD`. - Select one of the following. - [x] I have added tests. - `/test` for `lit` tests - `/unittest` for C++ tests - `/python/test` for end-to-end tests - [ ] This PR does not need a test because `FILL THIS IN`. - Select one of the following. - [ ] I have not added any `lit` tests. - [x] The `lit` tests I have added follow these [best practices](https://mlir.llvm.org/getting_started/TestingGuide/#filecheck-best-practices), including the "tests should be minimal" section. (Usually running Python code and using the instructions it generates is not minimal.)
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Fixes #5464