[llvm] [llvm] Add a tool to check mustache compliance against the public spec (PR #142813)

[Paul Kirth via llvm-commits]

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+llvm-mustachespec - LLVM tool to test Mustache Compliance Library
+=================================================================
+
+llvm-mustachespec test the mustache spec conformance of the LLVM
+mustache library. The spec can be found here https://github.com/mustache/spec
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ilovepi wrote:

Ack. 

https://github.com/llvm/llvm-project/pull/142813