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This is a simple fix that brings the compilation time from 5min to 5s on a specific real-world example. It's a large chain of computation in a crypto routine (always a problem for SCEV). A unit test is not feasible and there would be no way to check it. The fix is just basic good practice for dealing with SCEVs, there's no risk of regression. Patch by Daniel Reynaud! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220622 91177308-0d34-0410-b5e6-96231b3b80d8
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