[clang] Fix crash with modules and constexpr destructor (PR #69076)

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

> Well, this patch is up since almost three months now (!). Sure, we can keep carrying a similar fix downstream, but ideally I would really like to get rid of as many local changes as possible. That's not possible without proper review, but the current situation is quite unsatisfactory...

Yeah, fully understood. I have a lot of similar experiences... 1~2 weeks is not long in comparing with 3 months.

https://github.com/llvm/llvm-project/pull/69076