[llvm] Add [[maybe_unused]] to a variable used only in assert in VPlan.h (PR #124173)

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``````````bash
git-clang-format --diff 6d5697f7cb4e933d2f176c46b7ac05a9cbaeb8b6 cb616f8d010142ec3b115e089e90345dcb943aa0 --extensions h -- llvm/lib/Transforms/Vectorize/VPlan.h
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VPlan.h b/llvm/lib/Transforms/Vectorize/VPlan.h
index 3dd9c139d8..16c64f32ab 100644
--- a/llvm/lib/Transforms/Vectorize/VPlan.h
+++ b/llvm/lib/Transforms/Vectorize/VPlan.h
@@ -2461,7 +2461,8 @@ public:
       : VPSingleDefRecipe(VPDef::VPPartialReductionSC,
                           ArrayRef<VPValue *>({Op0, Op1}), ReductionInst),
         Opcode(Opcode) {
-    [[maybe_unused]] auto *AccumulatorRecipe = getOperand(1)->getDefiningRecipe();
+    [[maybe_unused]] auto *AccumulatorRecipe =
+        getOperand(1)->getDefiningRecipe();
     assert((isa<VPReductionPHIRecipe>(AccumulatorRecipe) ||
             isa<VPPartialReductionRecipe>(AccumulatorRecipe)) &&
            "Unexpected operand order for partial reduction recipe");

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https://github.com/llvm/llvm-project/pull/124173