[llvm] [VPlan] Introduce explicit broadcasts for live-ins. (PR #124644)

[via llvm-commits]

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@@ -1558,6 +1566,13 @@ class VPWidenGEPRecipe : public VPRecipeWithIRFlags {
   void print(raw_ostream &O, const Twine &Indent,
              VPSlotTracker &SlotTracker) const override;
 #endif
+
+  /// Returns true if the recipe only uses the first lane of operand \p Op.
+  bool onlyFirstLaneUsed(const VPValue *Op) const override {
+    assert(is_contained(operands(), Op) &&
+           "Op must be an operand of the recipe");
+    return Op == getOperand(0);
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ayalz wrote:

```suggestion
    return Op == getOperand(0) && isPointerLoopInvariant();
```
?


https://github.com/llvm/llvm-project/pull/124644