[VPlan] Add ExitingIVValue VPInstruction. (#175651) Add a new VPInstruction opcode to compute the exiting value of an induction variable after vectorization. This replaces the pattern of extracting the last lane from the last part of the induction backedge value when applicable. This allows us to always use the pre-computed IV end value. It will also allow unifying end value creation for both induction resume and exit values. PR: https://github.com/llvm/llvm-project/pull/175651
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