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8ce317bf15
when unroll runtime iteration loop. In llvm::UnrollRuntimeLoopRemainder, if the loop to be unrolled is the inner loop inside a loop nest, the scalar evolution needs to be dropped for its parent loop which is done by ScalarEvolution::forgetLoop. However, we can postpone forgetLoop to the end of UnrollRuntimeLoopRemainder so TripCountSC expansion can still reuse existing value. Differential Revision: https://reviews.llvm.org/D23572 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279748 91177308-0d34-0410-b5e6-96231b3b80d8