[libc-commits] [libc] feat(filemode): implement class and helper functions to handle file modes for an opened file (PR #220906)

[Michael Jones via libc-commits]

https://github.com/michaelrj-google commented:

left some minor comments, but overall this looks good! I'll approve and merge once these are fixed.

https://github.com/llvm/llvm-project/pull/220906