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This method computes the edge bundles that should be live when splitting around a compact region. This is independent of interference. The function returns false if the live range was already a compact region, or the compact region doesn't have any live bundles - it would be the same as splitting around basic blocks. Compact regions are computed using the normal spill placement code. We pretend there is interference in all live-through blocks that don't use the live range. This removes all edges from the Hopfield network used for spill placement, so it converges instantly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135847 91177308-0d34-0410-b5e6-96231b3b80d8