[clang] [Clang] [C++26] Implement P2573R2: `= delete("should have a reason");` (PR #86526)

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Sirraide wrote:

> did you see this comment? [#86526 (review)](https://github.com/llvm/llvm-project/pull/86526#pullrequestreview-1976690810)

Thanks for reminding me; I did see that one but ended up forgetting about it because I was sick for pretty much all of last week; I’ll take a look at it later.


https://github.com/llvm/llvm-project/pull/86526