[clang] [analyzer] Refactor MallocChecker to use `BindExpr` in `evalCall` (PR #106081)

[Balazs Benics via cfe-commits]

https://github.com/steakhal commented:

I didn't really have time to look in depth into this.
To me, a switch from eval-call to post-call should be NFC for the most part. It would be nice if we could separate out that NFC part in a PR, and then deal with the breaking changes in a limited PR. That would ease the reviewers job I think.

https://github.com/llvm/llvm-project/pull/106081