[clang] [coverage] fix crash in code coverage and `if constexpr` with `ExprWithCleanups` (PR #80292)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

Changes LGTM, but please add a release note to `clang/docs/ReleaseNotes.rst` so users know about the fix.

Thank you for the fix!

https://github.com/llvm/llvm-project/pull/80292