Caitlyn Cano c6828e0cea [mlir] Make ConversionTarget dynamic legality callbacks composable ...

* Change callback signature `bool(Operation *)` -> `Optional<bool>(Operation *)`
* addDynamicallyLegalOp add callback to the chain
* If callback returned empty `Optional` next callback in chain will be called

Differential Revision: https://reviews.llvm.org/D110487

2021-10-12 13:05:54 +03:00

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