[PATCH] [GraphWriter] Attempt to open .dot files with xdg-open/open first

[Matthias Braun]

On OS/X you right click the file->"get information" and change the "open with:" for all files of that type.

Anyway I don't feel strongly about the patch, feel free to revert it if this causes more trouble than it helps.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6534

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