[clang] [clang] fix sema init crash for not checking a ExprResult (PR #98102)

[Davide Italiano via cfe-commits]

dcci wrote:

> You should also add test coverage (clang/test/SemaCXX) for the changes and a release note (clang/docs/ReleaseNotes.rst).

@AaronBallman -- are you OK with a crash-on-invalid (the one in first post)? The original example we had crashed on valid code, but reducing a 35MB file with a lot of SFINAE is taking weeks with c-reduce.
Thanks for your review :)

https://github.com/llvm/llvm-project/pull/98102