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1274ced8a3
scheduled in multiple regions, liveness data used by the anti-dependence breaker is carried from one region to the next, however the information reflects the state of the instructions before scheduling. After scheduling, there may be new live range overlaps. Handle this by pessimizing the liveness data carried between regions to the point where it will be conservatively correct now matter how the earlier region is scheduled. This fixes a miscompilation in 176.gcc with the post-RA scheduler enabled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66558 91177308-0d34-0410-b5e6-96231b3b80d8
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