[PATCH] [DAGCombine] Don't generate atrocious shuffles for constant vectors

[Sanjay Patel]

In http://reviews.llvm.org/D7093#111473, @mkuper wrote:

> What do you think about committing the constant version first, and then looking at the rest?


Sure, I have no problem with that. I'll file a separate bug so we don't lose it.


http://reviews.llvm.org/D7093

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