[clang] [clang][Diagnostics] Highlight code snippets (PR #66514)

[Christopher Di Bella via cfe-commits]

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In-Reply-To: <llvm/llvm-project/pull/66514/clang at github.com>


cjdb wrote:

I'm okay with the change in general.

https://github.com/llvm/llvm-project/pull/66514