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

[Shafik Yaghmour via cfe-commits]

shafik wrote:

I think this change makes sense but I am not crazy about how we deal w/ full-expressions right now with these `FullExpressionRAII`, it feels very ad-hoc and it takes a bunch of time to understand why they are needed where they are.

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