llvm-project

c1d33452 - [MLIR][Presburger][NFC] Don't add empty regions when unioning PWMA functions (#182468)

[MLIR][Presburger][NFC] Don't add empty regions when unioning PWMA functions (#182468) This will prevent exponential behaviour in lexicographic maximum computation, where the `tiebreak` predicate is very likely to return empty regions.