[clang] [analyzer] Assume the result of 'fopen' can't alias with 'std{in,out,err}' (PR #100085)

[Donát Nagy via cfe-commits]

https://github.com/NagyDonat approved this pull request.

LGTM, this is a nice improvement. I vaguely recall that a few months ago somebody else on our team had trouble with false positives similar false positives, so it's good to see that these will be fixed.

https://github.com/llvm/llvm-project/pull/100085