Rahul Joshi 8067ced144 [MLIR] Introduce generic visitors. ...

- Generic visitors invoke operation callbacks before/in-between/after visiting the regions
  attached to an operation and use a `WalkStage` to indicate which regions have been
  visited.
- This can be useful for cases where we need to visit the operation in between visiting
  regions attached to the operation.

Differential Revision: https://reviews.llvm.org/D116230

2022-01-14 09:15:27 -08:00

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