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

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


cor3ntin wrote:

> Here are the results for a quick implementation of check points: http://llvm-compile-time-tracker.com/compare.php?from=12e425d0cf9bca072c7b2138e50acbc5f1cd818c&to=99f3a7853f9fa83bffe3b4d04e41e744169d426a&stat=instructions:u
> 
> With a little more fiddling: http://llvm-compile-time-tracker.com/compare.php?from=12e425d0cf9bca072c7b2138e50acbc5f1cd818c&to=0ee6dd17747818b05a1d504e4916ce46ef061226&stat=instructions:u

Imo this is reasonable, we should go in that direction. It's not free but it is predictable

Further improvements:
 * cache the lookup of `CheckPoints[FID]` as it should not change between calls to `BeginSourceFile`
 * Play with reserve and/or dequeue





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