[VPlan] Replace ExtractLast(Elem|LanePerPart) with ExtractLast(Lane/Part) (#164124) Replace ExtractLastElement and ExtractLastLanePerPart with more generic and specific ExtractLastLane and ExtractLastPart, which model distinct parts of extracting across parts and lanes. ExtractLastElement == ExtractLastLane(ExtractLastPart) and ExtractLastLanePerPart == ExtractLastLane, the latter clarifying the name of the opcode. A new m_ExtractLastElement matcher is provided for convenience. The patch should be NFC modulo printing changes. PR: https://github.com/llvm/llvm-project/pull/164124
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