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fb42ed2925
The routine that determines an alignment given some SCEV returns zero if the answer is unknown. In a case where we could determine the increment of an AddRec but not the starting alignment, we would compute the integer modulus by zero (which is illegal and traps). Prevent this by returning early if either the start or increment alignment is unknown (zero). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217544 91177308-0d34-0410-b5e6-96231b3b80d8
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