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d3aa46a1bc
Fixes a logic error in the MachineScheduler found by Steve Montgomery (and confirmed by Andy). This has gone unfixed for months because the fix has been found to introduce some small performance regressions. However, Andy has recommended that, at this point, we fix this to avoid further dependence on the incorrect behavior (and then follow-up separately on any regressions), and I agree. Fixes PR18883. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219512 91177308-0d34-0410-b5e6-96231b3b80d8
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