Matthias Springer 695a5a6a66 [mlir][IR] Trigger notifyOperationRemoved callback for nested ops (#66771) ...

When cloning an op, the `notifyOperationInserted` callback is triggered
for all nested ops. Similarly, the `notifyOperationRemoved` callback
should be triggered for all nested ops when removing an op.

Listeners may inspect the IR during a `notifyOperationRemoved` callback.
Therefore, when multiple ops are removed in a single
`RewriterBase::eraseOp` call, the notifications must be triggered in an
order in which the ops could have been removed one-by-one:

* Op removals must be interleaved with `notifyOperationRemoved`
callbacks. A callback is triggered right before the respective op is
removed.
* Ops are removed post-order and in reverse order. Other traversal
orders could delete an op that still has uses. (This is not avoidable in
graph regions and with cyclic block graphs.)

Differential Revision: Imported from https://reviews.llvm.org/D144193.

2023-09-20 08:45:46 +02:00

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