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

[Timm Baeder via cfe-commits]

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


tbaederr wrote:

![Screenshot from 2023-09-20 19-37-00](https://github.com/llvm/llvm-project/assets/49720664/ea964fca-647c-4a62-82fd-f17f37f96a92)

Here's green for comments and cyan for literals

![Screenshot from 2023-09-20 19-38-53](https://github.com/llvm/llvm-project/assets/49720664/5526fcd4-a08a-4c12-8f49-c612f0c9c74d)
 And this is with magenta literals.

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