[clang] [llvm] [FlowSensitive] [StatusOr] [2/N] Add minimal model (PR #162932)

[Gábor Horváth via cfe-commits]

Xazax-hun wrote:

Feel free to merge it, I will not have time to do a thorough review. I skimmed through quickly and nothing suspicious stood out. 

https://github.com/llvm/llvm-project/pull/162932