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

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=?utf-8?q?=C3=96mer_Sinan_A=C4=9Facan?= <omer at osa1.net>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/228388 at github.com>


https://github.com/serge-sans-paille approved this pull request.

LGTM now, thanks 🙇 

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