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The normalization may cause assertion failures on SystemZ and some out-of-tree tests. The root cause is that unknown probabilities are materialized into known ones by calling getSuccProbability(), which is then used to add another successor to the same MBB which results in mixed known and unknown probabilities. But currently those mixed probabilities cannot be normalized. I will compose another patch to fix the root issue. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255530 91177308-0d34-0410-b5e6-96231b3b80d8
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