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LoopRotate: When reconstructing loop simplify form don't split edges from indirectbrs. Yet another chapter in the endless story. While this looks like we leave the loop in a non-canonical state this replicates the logic in LoopSimplify so it doesn't diverge from the canonical form in any way. PR21968 git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_36@231698 91177308-0d34-0410-b5e6-96231b3b80d8
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