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05bd43dc6e
If a loop predecessor has an invoke as its terminator, and the return value from that invoke is used to determine the loop iteration space, then we can't insert a computation based on that value in the loop predecessor prior to the terminator (oops). If there's such an invoke, or just no predecessor for that matter, insert a new loop preheader. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228488 91177308-0d34-0410-b5e6-96231b3b80d8
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