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0cc137e051
This does some improvements/cleanup to the recently introduced scavengeRegisterBackwards() functionality: - Rewrite findSurvivorBackwards algorithm to use the existing LiveRegUnit::accumulateBackward() code. This also avoids the Available and Candidates bitset and just need 1 LiveRegUnit instance (= 1 bitset). - Pick registers in allocation order instead of register number order. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305817 91177308-0d34-0410-b5e6-96231b3b80d8
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