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

[Erich Keane via cfe-commits]

Timm =?utf-8?q?Bäder?= <tbaeder at redhat.com>,
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>


erichkeane wrote:

> ![Screenshot from 2023-09-20 19-37-00](https://user-images.githubusercontent.com/49720664/269370966-ea964fca-647c-4a62-82fd-f17f37f96a92.png)
> 
> Here's green for comments and cyan for literals
> 
> ![Screenshot from 2023-09-20 19-38-53](https://user-images.githubusercontent.com/49720664/269371331-5526fcd4-a08a-4c12-8f49-c612f0c9c74d.png) And this is with magenta literals.

Both of these are my favorites so far.  

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