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

[Pavel Skripkin via cfe-commits]

pskrgag wrote:

> To me, a switch from eval-call to post-call should be NFC for the most part.

It is, but it causes  `MallocChecker` to no longer look into body of the functions, because of `evalCall` semantics,  which is breaking change. So I am not quite sure how to split this PR into two....

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