[llvm] [VPlan] Update final exit value via VPlan. (PR #112147)

[via llvm-commits]

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@@ -1422,6 +1422,11 @@ class VPIRInstruction : public VPRecipeBase {
            "Op must be an operand of the recipe");
     return true;
   }
+  bool onlyFirstLaneUsed(const VPValue *Op) const override {
+    assert(is_contained(operands(), Op) &&
+           "Op must be an operand of the recipe");
+    return true;
+  }
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ayalz wrote:

Fix can be committed independently, but tested only now?

https://github.com/llvm/llvm-project/pull/112147