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2a7fbb1927
We won't find a root with index zero in any loop that we are able to reroll. However, we may find one in a non-rerollable loop, so bail gracefully instead of failing hard. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229406 91177308-0d34-0410-b5e6-96231b3b80d8