[clang] [C++20] [Modules] Introduce thin BMI (PR #71622)

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

> > Since there is no meaningful review opinions here, let's continue it in a new and clean PR: #75894
> 
> Note that this leaves behind all who have hit "Subscribe" on this PR to keep tabs on things (I wish Github provided a way to mark-as-duplicate and merge the subscriber list). All of the references to this PR are now confused as well. What benefit does a "clean" PR provide?

>From my experience, a cleaner PR will be easier for new people to get the context or we look back after times. The more the comments are, the more confused readers get. Generally a cleaner PR is not suggested since it lost the context. But for this specific example, I think it makes sense since the context here is not so meaning full.

> Note that this leaves behind all who have hit "Subscribe" on this PR to keep tabs on things 

Sorry for that. But I think it may not be a big deal since people who still want to take an eye this can made it by clicking two times simply.



https://github.com/llvm/llvm-project/pull/71622