[PATCH] D46499: [Support] Add docs for 'openFileFor{Write,Read}'

[Steve Canon via Phabricator via llvm-commits]

scanon added a comment.

Two quick notes as someone who has never used these functions:

- Name is really the *path* of the file to open, right?
- What happens to ResultFD if the function fails?


Repository:
  rL LLVM

https://reviews.llvm.org/D46499