[llvm] [LV] Use DenseMap::keys to improve code (NFC) (PR #156014)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: Ramkumar Ramachandra (artagnon)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/156014.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 6317bc3c20e25..5d747d43ed26b 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -8716,7 +8716,7 @@ VPlanPtr LoopVectorizationPlanner::tryToBuildVPlanWithVPRecipes(
   // to remove the need to keep a map of masks beyond the predication
   // transform.
   RecipeBuilder.updateBlockMaskCache(Old2New);
-  for (const auto &[Old, _] : Old2New)
+  for (VPValue *Old : Old2New.keys())
     Old->getDefiningRecipe()->eraseFromParent();
 
   assert(isa<VPRegionBlock>(Plan->getVectorLoopRegion()) &&

``````````

</details>


https://github.com/llvm/llvm-project/pull/156014