[clang] [clang][analyzer] Add checker 'security.SetgidSetuidOrder'. (PR #91445)

[Donát Nagy via cfe-commits]

https://github.com/NagyDonat commented:

You forgot to add `CDM::CLibrary` in the definition of `SetuidDesc` and `SetgidDesc` (see the new inline comment).

There are also several inline comments from my previous review where I'm expecting an answer (not necessarily a code change -- in each case I can accept the current solution if you would prefer it). 

https://github.com/llvm/llvm-project/pull/91445