[clang] [clang][analyzer] Add defer_lock_t modelling to BlockInCriticalSectionChecker (PR #168338)

[Balázs Benics via cfe-commits]

https://github.com/steakhal commented:

Thanks for the review. LGTM for me, the raised suggestions look good to me.

https://github.com/llvm/llvm-project/pull/168338