[PATCH] [GraphWriter] Don't wait on xdg-open when not on Apple

[Matt Arsenault]

On 07/01/2015 11:05 AM, Matthias Braun wrote:
> As we are on the topic: I think the current approach of having llvm spawn the viewer and wait/not wait for it should be changed: I'd really prefer llvm just writing a bunch of .dot files to the current directory (or /tmp) giving them some sensible names+numbers and maybe print those names.
Yes, I also have a problem with the way the temp dot files are deleted 
after you close the viewer. I would rather they stay around to help keep 
track of whatever I'm working on

-Matt