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SCEVUnknowns, as the non-SCEVUnknown cases in the getSCEVAtScope code can also end up repeatedly climing through the same expression trees, which can be unusably slow when the trees are very tall. Also, add a quick check for SCEV pointer equality to the main SCEV comparison routine, as the full comparison code can be expensive in the case of large expression trees. These fix compile-time problems in some pathlogical cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80623 91177308-0d34-0410-b5e6-96231b3b80d8
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