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

[Timm Baeder via cfe-commits]

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tbaederr wrote:

Preliminary results show a slight degradation: http://llvm-compile-time-tracker.com/?config=NewPM-O3&stat=instructions%3Au&remote=tbaederr

Might have to create fewer check points.

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