[PATCH] SelectionDAG: add a -filter-view-dags=<string> cmd line option

[Matthias Braun]

My 2cents: In another compiler I worked with this simply worked by creating several files on the harddrive. This required you to start the viewer manually but was way more convenient when switching back and forth between different functions and phases of the compilation...


http://reviews.llvm.org/D6948

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