[PATCH] MachineFrameInfo: Simplify pristine register calculation.

[Matthias Braun]

Thanks for the review.

I think heads-up message is not necessary: The previous semantics just allowed us to have fewer registers in the live-in sets in theory. There is no change for code that does not rely on live-in sets. For code relying on the live-in sets we won't have a change as well because the live-in sets are not changed by this commit.


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http://reviews.llvm.org/D10101

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