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A split candidate can have a null PhysReg which means that it doesn't map to a real interference pattern. Instead, pretend that all through blocks have interference. This makes it possible to generate compact regions where the live range doesn't go through blocks that don't use it. The live range will still be live between directly connected blocks with uses. Splitting around a compact region tends to produce a live range with a high spill weight, so it may evict a less dense live range. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135845 91177308-0d34-0410-b5e6-96231b3b80d8
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