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7a87f8a6700c2184254eb2e8d8c9048975ad3b62
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. llvm-svn: 219512
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