[clang] [NFC][analyzer] Spread use of 'Expr*' instead of 'Stmt*' (PR #188319)

[Balázs Benics via cfe-commits]

steakhal wrote:

> I don't understand this test failure... – it is very likely unrelated to my PR since here the last few commits only changed comments.

Yep. That's mine. Dw. Rebase again. It should be fixed now on main. Have a look at git log if you want.

https://github.com/llvm/llvm-project/pull/188319