[PATCH] Fix instruction scheduling live register tracking

[Andrew Trick]

Everyone wants to replace this code. But that rumor is probably two years old. Even after we have a replacement, the old code will stick around until all the targets migrate. So feel free to fixup the code. It will be in use for *at least* another year.

Andy

> On Jun 24, 2015, at 9:52 AM, Paweł Bylica <chfast at gmail.com> wrote:
> 
> No true buildbot failures so far so I'm quite happy about the fix. Thanks for all your help.
> 
> Will this code stay here for long? I've heard some rumors that it is going to be replaced. If it stays I would like to refactor it a bit.
> 
> 
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>  rL LLVM
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> http://reviews.llvm.org/D9993
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