[clang] [analyzer] Adding taint analysis capability to unix.Malloc checker (PR #92420)

[Balazs Benics via cfe-commits]

steakhal wrote:

> I'll port this patch downstream to see how this would behave on the Juliet C++ benchmark or on some real-world code.

Ah nvm. llvm/main diverged quite a bit since 18.1.6. I can't just pick this one. Given this, I won't backport and test this PR.

https://github.com/llvm/llvm-project/pull/92420