[llvm] [llvm-lit][test] Precommit tests for lit's built-in cat command (PR #101530)

[Paul Kirth via llvm-commits]

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+# C Program to generate all ASCII characters in allchars.txt
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ilovepi wrote:

allchars is marked as a binary file in the PR. Can we either add some leading text or a file extension to make it clear to git/Github that it isn't a binary file? I know you had issues w/ `.txt` extensions getting identified as tests, but perhaps another type of extension would work? or maybe just some leading string before the strange characters?

https://github.com/llvm/llvm-project/pull/101530