MFC r236260:

MFC r236260:

Pull in r156591 from upstream llvm trunk:

  Allow unique_file to take a mode for file permissions, but default
  to user only read/write.

and r156592 from upstream clang trunk:

  For final output files create them with mode 0664 to match other
  compilers and expected defaults.

This should fix clang creating files with mode 0600.

Reported by:	James <james@hicag.org>

git-svn-id: svn://svn.freebsd.org/base/stable/9@236385 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f