[clang-tools-extra] [llvm] [llvm] add tool to verify mustache library (PR #111487)

[Nikita Popov via llvm-commits]

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+llvm-mustachespec - LLVM tool to test Mustache Compliance Library
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nikic wrote:

```suggestion
llvm-mustachespec - LLVM tool to test Mustache Library Compliance
```
Possibly?

https://github.com/llvm/llvm-project/pull/111487