[Mlir-commits] [mlir] [mlir] fix a crash (PR #68519)

[llvmlistbot at llvm.org]

lipracer wrote:

TODO:
1. add a test
2. `SimpleAffineExprFlattener` this class still has crashes
I'm not sure if this is a reasonable solution.

https://github.com/llvm/llvm-project/pull/68519