[clang] [Clang] Qualified functions can't decay into pointers (PR #90353)

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https://github.com/cor3ntin commented:

Thanks!
I think the general approach makes sense

There are a few DR that might be worth mentioning/add tests for/look into

https://cplusplus.github.io/CWG/issues/713.html
https://cplusplus.github.io/CWG/issues/1417.html
https://cplusplus.github.io/CWG/issues/1584.html 

https://github.com/llvm/llvm-project/pull/90353