[clang] [clang] Don't emit bogus dangling diagnostics when `[[gsl::Owner]]` and `[[clang::lifetimebound]]` are used together. (PR #108280)

[Haojian Wu via cfe-commits]

hokein wrote:

> Can you add some more details to the summary e.g. "The fix adds an additional check in isGSLOwner() for Owner attribute" or something along those lines.

Done.

https://github.com/llvm/llvm-project/pull/108280