[mlir][Transforms][NFC] Dialect Conversion: Earlier `isIgnored` check (#148360) When legalizing an operation, the conversion driver skips "ignored" ops. Ops are ignored if they are inside of a recursively legal operation or if they were erased. This commit moves the "is ignored" check a bit earlier: it is now checked before checking if the op is recursively legal. This is in preparation of the One-Shot Dialect Conversion refactoring: erased ops should not be accessed, not even for checking recursive legality. This commit is NFC: When an op is erased, it is added to the set of ignored ops and we don't want to process it, regardless of legality. Nested ops are also added to the set of ignored ops when erasing an enclosing op.
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