[clang] [analyzer] Avoid use of `CallEvent`s with obsolete state (PR #160707)

[Donát Nagy via cfe-commits]

NagyDonat wrote:

In the meantime I wrote the follow-up commit: https://github.com/llvm/llvm-project/pull/162673/files
I intend to merge it after merging this commit (that's why its commit message is worded from a POV where this commit is already merged).

https://github.com/llvm/llvm-project/pull/160707