RegisterPressure: Move LiveInRegs/LiveOutRegs from RegisterPressure to PressureTracker

Differential Revision: http://reviews.llvm.org/D12814

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247943 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed