[VPlan] Add VPlan-based addMinIterCheck, replace ILV for non-epilogue. (#153643) This patch adds a new VPlan-based addMinimumIterationCheck, which replaced the ILV version for the non-epilogue case. The VPlan-based version constructs a SCEV expression to compute the minimum iterations, use that to check if the check is known true or false. Otherwise it creates a VPExpandSCEV recipe and emits a compare-and-branch. When using epilogue vectorization, we still need to create the minimum trip-count-check during the legacy skeleton creation. The patch moves the definitions out of ILV. PR: https://github.com/llvm/llvm-project/pull/153643
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