[Mlir-commits] [mlir] [mlir][debug] Make DICompileUnitAttr recursive. (PR #190808)

[Tobias Gysi]

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gysit wrote:

```suggestion
    OptionalParameter<"DIFileAttr">:$file,
    OptionalParameter<"StringAttr">:$producer,
    OptionalParameter<"bool">:$isOptimized,
    OptionalParameter<"DIEmissionKind">:$emissionKind,
```
I believe for the other self recursive types we intentionally made all fields optional so that a self recursive instance does not carry any data (if it would that would be redundant and there may still be cycles depending on the field).

https://github.com/llvm/llvm-project/pull/190808