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loop information won't see it, and we could have unreachable blocks pointing to the non-header node of blocks in a natural loop. This isn't tidy, so have the loopsimplify pass clean it up. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12380 91177308-0d34-0410-b5e6-96231b3b80d8