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MachineInstr sequence. This uses the new target interface for tracking register pressure using pressure sets to model overlapping register classes and subregisters. RegisterPressure results can be tracked incrementally or stored at region boundaries. Global register pressure can be deduced from local RegisterPressure results if desired. This is an early, somewhat untested implementation. I'm working on testing it within the context of a register pressure reducing MachineScheduler. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155454 91177308-0d34-0410-b5e6-96231b3b80d8
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