[clang] [alpha.webkit.UnretainedLocalVarsChecker] Treat the collection of a fast enumeration as the origin of its element (PR #230818)

[Balázs Benics via cfe-commits]

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

Looks pretty good - but probably doesn't work for structured-bindings.
Nevertheless, that doesn't mean we should necessarily cover it (I think we should though).

https://github.com/llvm/llvm-project/pull/230818