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

[Timm Baeder via cfe-commits]

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tbaederr wrote:

We can easily get the size of the file in no time, right? What if we just use an upper limit of, say, 2MB and stop highlighting altogether if the input file is bigger than that? It's not perfect but that's what all the online tools do anyway and it would give us lexing without performance degradation.

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