[clang] [NFC][analyzer] Cleanup checker calls in `ExprEngine::ProcessStmt`, `ExprEngine::Visit*` (PR #218691)

[Balázs Benics via cfe-commits]

https://github.com/steakhal commented:

Given the track record of unintended changes, what testing methodologies did you follow for this PR? How can we reduce the risk of applying this change?

https://github.com/llvm/llvm-project/pull/218691