[llvm] [llvm/llvm-project][Coroutines] Improve debugging and minor refactoring (PR #104642)

[Adrian Vogelsgesang via llvm-commits]

vogelsgesang wrote:

> They are all related to improving debugging.

You would probably still have an easier time getting the changes merged, if you would split them into separate reviews. E.g., the adjusted comments and renaming "inference -> "interference" are all clear wins. You could already get approvals and ship those parts, while the discussion on the naming of basic blocks is still ongoing

https://github.com/llvm/llvm-project/pull/104642