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When using bit tests for hole checks, we call AddPredecessorToBlock to give the phi node a value from the bit test block. This would break if we've previously called removePredecessor on the default destination because the switch is fully covered. Test case by Mark Lacey. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235771 91177308-0d34-0410-b5e6-96231b3b80d8
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