[clang] New indent pp directives before hash with code (PR #186686)

[Björn Schäpers via cfe-commits]

https://github.com/HazardyKnusperkeks requested changes to this pull request.

This change seems pretty invasive, so I have to quote:

> 
> Adding additional style options
> 
> Each additional style option adds costs to the clang-format project. Some of these costs affect the clang-format development itself, as we need to make sure that any given combination of options work and that new features don’t break any of the existing options in any way. There are also costs for end users as options become less discoverable and people have to think about and make a decision on options they don’t really care about.
> 
> The goal of the clang-format project is more on the side of supporting a limited set of styles really well as opposed to supporting every single style used by a codebase somewhere in the wild. Of course, we do want to support all major projects and thus have established the following bar for adding style options. Each new style option must:
> 
>  * be used in a project of significant size (have dozens of contributors)
>  *  have a publicly accessible style guide
>  * have a person willing to contribute and maintain patches
> 

If that is given, you need to add tests, and I think a lot of them.

https://github.com/llvm/llvm-project/pull/186686