[llvm] [VPlan] Replace ExtractLast(Elem|LanePerPart) with ExtractLast(Lane/Part) (PR #164124)

[David Sherwood via llvm-commits]

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@@ -1405,10 +1403,10 @@ class VPIRInstruction : public VPRecipeBase {
     return true;
   }
 
-  /// Update the recipes first operand to the last lane of the operand using \p
-  /// Builder. Must only be used for VPIRInstructions with at least one operand
-  /// wrapping a PHINode.
-  void extractLastLaneOfFirstOperand(VPBuilder &Builder);
+  /// Update the recipe's first operand to the final lane of the operand using
+  /// \p Builder. Must only be used for VPIRInstructions with at least one
+  /// operand wrapping a PHINode.
+  void extractFinalLaneOfFirstOperand(VPBuilder &Builder);
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david-arm wrote:

Why the name change? Perhaps I'm missing something, but I don't know really what the difference is between `Last` and `Final`. If this is related to ExtractLast, etc. then surely `Last` is more in-keeping with the operation?

https://github.com/llvm/llvm-project/pull/164124