[clang] [clang][bytecode] Diagnose non-block pointers in __builtin_is_within_lifetime (PR #228337)

[Oliver Hunt via cfe-commits]

https://github.com/ojhunt approved this pull request.

It would be easier to review this kind of PR if the function movements are done in a separate commit (not necessarily merged separately)

The code changes LGTM, but I would like the test expectations tightened up

https://github.com/llvm/llvm-project/pull/228337