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

[Jonas Hahnfeld via cfe-commits]

hahnjo wrote:

> address my previous comment: [#69076 (comment)](https://github.com/llvm/llvm-project/pull/69076#issuecomment-1780327252)

I had already expanded the commit message with the full details, now also copied to the PR summary. Is that sufficient to address the comment?

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