[clang] [clang] Fix a use-after-free in expression evaluation (PR #118480)

[kadir çetinkaya via cfe-commits]

kadircet wrote:

hi @AaronBallman, no unfortunately we didn't make any progress here, and I just verified that reproducer from  https://github.com/llvm/llvm-project/pull/118480#issuecomment-2538988006 is still triggering the issue (with -std=c++20).

https://github.com/llvm/llvm-project/pull/118480