[clang] [clang][analyzer] Teach the BlockInCriticalSectionChecker about O_NONBLOCK streams (PR #127049)

[via cfe-commits]

flovent wrote:

> I pushed a couple cleanups. I hope you don't mind. Now it looks excellent. Thank you for your contribution!

these commits looks very good, I don't mind at all, and happy to have my first commit to CSA.



> Can I merge this? @flovent @Xazax-hun

I am ok to merge

https://github.com/llvm/llvm-project/pull/127049