[llvm] [opt-viewer] Fix demangler usage with multiprocessing (PR #228388)

[Florian Hahn via llvm-commits]

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In-Reply-To: <llvm.org/llvm/llvm-project/pull/228388 at github.com>


https://github.com/fhahn commented:

Thanks for the fix!

It would be good if we had at least basic tests for the functionality

https://github.com/llvm/llvm-project/pull/228388