[clang] [clang][analyzer] Added Abstract VAList region normalization into MemRegionManager (PR #181948)

[Balázs Benics via cfe-commits]

steakhal wrote:

We have a couple of GH issues. How did you decide to work no this TODO? @tahadostifam
I want to know a little about your motivation.

https://github.com/llvm/llvm-project/pull/181948