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avoid revisiting nodes more than once. This eliminates a source of potentially exponential behavior. For a small function in 191.fma3d (hexah_stress_divergence_), this speeds up isel from taking > 20mins to taking 0.07s. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22680 91177308-0d34-0410-b5e6-96231b3b80d8