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Live ranges with a constrained register class may benefit from splitting around individual uses. It allows the remaining live range to use a larger register class where it may allocate. This is like spilling to a different register class. This is only attempted on constrained register classes. <rdar://problem/11438902> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157354 91177308-0d34-0410-b5e6-96231b3b80d8