[clang] [Webkit Checkers][SaferCpp] Detect base-to-derived downcasts laundered through void* in MemoryUnsafeCastChecker (PR #200294)

[Balázs Benics via cfe-commits]

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

If it works - it works. Let's merge this.

I didn't spot anything interesting this round.

https://github.com/llvm/llvm-project/pull/200294