[llvm] r185832 - Create files with the correct permission instead of changing it afterwards.

[Rafael Espíndola]

> The destructor will flush buffers, which I think will change the last
> modified time. That is why I want to first destroy the stream, then
> set the last modification time then close the file descriptor. I will
> try factoring the calls to open (and the flags raw_fd_ostream
> currently uses) and see what it looks like.

Attached. What do you think?
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