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

[Timm Baeder via cfe-commits]

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tbaederr wrote:

The latest commit keeps a list of pointers into the buffer and (potentially) updates it after every regular token lex (when we have a `Lexer`). We can then simply use that to get a starting point to lex from.

I'll have a look at the performance impact of regular parsing later.

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