[llvm] r278907 - [LTO] Introduce an Output class to wrap the output stream creation (NFC)

[Rafael Espíndola via llvm-commits]

> I’ll give a shot.
> Why is it a problem in this case?

I don't think there is a practical problem is here, it is just not as
obviously correct/safe.

Also, one of the long term ideas I used to have was to change the api
to completely hide the name, that would allow us to use O_TMPFILE when
available, fixing the annoying issue that we leave temporary files on
disk with the program "crashes" (like when restarting it in a
debugger).

Cheers,
Rafael