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

[Matthias Braun]

Hi chandlerc,

Most desktop environments let the users specify his preferred application per
file type. On mac/linux we can use open/xdg-open for that and should try this
first before starting a heuristic search for various programs.

I hope this is not going to be too much of a bikesched discussion, but I really
prefer it when I can configure the applications myself instead of having a
hardcoded default list, though after seeing r210148 which tries 'gv' before
'xdg-open' I wonder if there is a problem with that approach for some people?
Can you explain why you did this alp? Couldn't people just set their system to open all postscript files gv?

http://reviews.llvm.org/D6534

Files:
  lib/Support/GraphWriter.cpp
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