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

[Timm Baeder via cfe-commits]

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Timm =?utf-8?q?Bäder?= <tbaeder at redhat.com>,
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In-Reply-To: <llvm/llvm-project/pull/66514/clang at github.com>


tbaederr wrote:

On a fast machine, the timings with a Release build of clang are:
```
/root/llvm-project/clang/lib/Sema/SemaExpr.cpp:21870:15: error: static assertion failed
Lexed 21870 lines and 174105 Tokens
That took 14079 microseconds
That took 14 milliseconds
That took 0 seconds
```
There's no code being generated, so the entire command takes 9s. Without the assertion (for a successful build), the command takes 40s.

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