[Mlir-commits] [mlir] [mlir][scf] Fold away `scf.for` iter args cycles (PR #173436)

[Ivan Butygin]

Hardcode84 wrote:

@matthias-springer the reason at least that one downstream pattern broke is because it was expecting for directly forwarded block args to yields to be erased completely and not transformed back to dead block arg so the pattern rewriter looped. Considering we didn't managed to simplify old `scf.for` pattern much anyway, I would rather reverted and relanded this in the the original form where I only remove cycles of len > 1.

https://github.com/llvm/llvm-project/pull/173436