[PATCH] Fix instruction scheduling live register tracking

[Paweł Bylica]

I have a filling I'm going in circles.

Now it looks the best "fix" is to remove the case `I->getSUnit()->getHeight() < LiveRegGens[I->getReg()]->getHeight()` when updating LiveRegGen. Without this case LiveRegGen is set during unscheduling only if it was empty before.

I checked selfhosted regression tests and  test-suite. Now using the clang build with this change in my other projects.

Can someone give me an example when this removed case is needed?


http://reviews.llvm.org/D9993

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