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34c6f98034
Instead of computing a live interval per physreg, LiveIntervals can compute live intervals per register unit. This makes impossible the confusing situation where aliasing registers could have overlapping live intervals. It should also make fixed interferernce checking cheaper since registers have fewer register units than aliases. Live intervals for regunits are computed on demand, using MRI use-def chains and the new LiveRangeCalc class. Only regunits live in to ABI blocks are precomputed during LiveIntervals::runOnMachineFunction(). The regunit liveness computations don't depend on LiveVariables. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158029 91177308-0d34-0410-b5e6-96231b3b80d8
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