[clang] [Clang] Introduce `CXXTypeidExpr::hasNullCheck` (PR #95718)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

If you update the branch, you should be able to get rid of unrelated changes to `cxx_dr_status.html`.

https://github.com/llvm/llvm-project/pull/95718