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Rely on MachineRegisterInfo's knowledge of used physical registers. Move flat_scratch initialization earlier, so the uses are visible when making these decisions. This will make it easier to add another reserved register at the end for the stack pointer rather than handling another special case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301254 91177308-0d34-0410-b5e6-96231b3b80d8
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