[clang] [alpha.webkit.UnretainedLocalVarsChecker] Add a checker for local variables to NS and CF types. (PR #127554)

[Rashmi Mudduluru via cfe-commits]

https://github.com/t-rasmud approved this pull request.

Left some nitpicks. otherwise LGTM.

https://github.com/llvm/llvm-project/pull/127554