[LV] Add epilogue minimum iteration check in VPlan as well. (#189372) Update LV to also use the VPlan-based addMinimumIterationCheck for the iteration count check for the epilogue. As the VPlan-based addMinimumIterationCheck uses VPExpandSCEV, those need to be placed in the entry block for now, moving vscale * VF * IC to the entry for scalable vectors. The new logic also fails to simplify some checks involving PtrToInt, because they were only simplified when going through generated IR, then folding some PtrToInt in IR, then constructing SCEVs again. But those should be cleaned up by later combines, and there is not really much we can do other than trying to go through IR. PR: https://github.com/llvm/llvm-project/pull/189372
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