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- When scavenging a register, in addition to the spill, insert a restore before the first use. - Abort if client is looking to scavenge a register even when a previously scavenged register is still live. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59697 91177308-0d34-0410-b5e6-96231b3b80d8