[PATCH] MachineFrameInfo: Simplify pristine register calculation.

[Quentin Colombet]

> On May 28, 2015, at 4:16 PM, Matthias Braun <matze at braunis.de> wrote:
> 
> 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 in-tree yes, but we do not know for out-of-tree.

I just want to make sure we do not catch by surprise any out-of-tree target maintainer.
The semantic change is subtle.

Thanks,
-Quentin

> 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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