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

[Mehdi AMINI]

+llvm-commit

I don't have a strong opinion between string and number. Number is less messy and you always get them at the MI level or in SelectionDAG, on the other hand string matches the IR so is probably more convenient if you start from there.
I updated with the string version.


http://reviews.llvm.org/D6948

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