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more places to prevent gratuitous re-"runs" of these passes. The passes themselves don't do any work when run, but we keep spending time scheduling and running these needlessly when we really don't need to do so. This is the first patch towards fixing the really horrible loop pass pipeline fragmentation pointed out by Sanjoy in PR24804. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@261302 91177308-0d34-0410-b5e6-96231b3b80d8