llvm-project

989aadf4 - Revert "[mlir][affine] allow iter args as valid dims" (#140808)

Revert "[mlir][affine] allow iter args as valid dims" (#140808) Reverts llvm/llvm-project#139069: the original change that got reverted by that PR was in fact correct. Since we don't know how secondary iteration args evolve with loop iterations (e.g., the loop may be yielding the result of a function call or the state of a PRNG), we cannot statically represent them as an integer set bound by affine constraints, unlike primary iteration args where the evolution is clear.