Rafael Espindola d4b24eda73 Support outputting to /dev/null. ...

When writing to a non regular file we cannot rename to it. Since we
have to write, we may as well create a temporary file to avoid trying
to create an unique file in /dev when trying to write to /dev/null.

llvm-svn: 291485

2017-01-09 21:52:35 +00:00

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