[llvm] [NFC] Fix unused variable warning in release builds (PR #174079)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-vectorizers

Author: Mel Chen (Mel-Chen)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/174079.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Vectorize/LoopVectorize.cpp (+1-1) 


``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index f90937ecedad9..d002dc89498a3 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -7253,7 +7253,7 @@ VectorizationFactor LoopVectorizationPlanner::computeBestVF() {
   // * EVL-based VPlans with gather/scatters (the VPlan-based cost model uses
   //   vp_scatter/vp_gather).
   // The legacy cost model doesn't properly model costs for such loops.
-  bool UsesEVLGatherScatter =
+  [[maybe_unused]] bool UsesEVLGatherScatter =
       any_of(VPBlockUtils::blocksOnly<VPBasicBlock>(vp_depth_first_shallow(
                  BestPlan.getVectorLoopRegion()->getEntry())),
              [](VPBasicBlock *VPBB) {

``````````

</details>


https://github.com/llvm/llvm-project/pull/174079