[clang] [analyzer] Fix crash in PaddingChecker on dependent field types (PR #232986)

[Balázs Benics via cfe-commits]

https://github.com/steakhal commented:

Have you used AI, and read the policies around that?
What alternatives have you considered?

In particular, I'm interested in why should we handle this check at the place where you propose - compared to bailing out earlier - at the top, or not even traversing anything in dependent contexts. So I'm curious of what you think about this.

https://github.com/llvm/llvm-project/pull/232986