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

[Ramkumar Ramachandra via llvm-commits]

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

None

>From 5ab16e1aaa4c491bca4dc69e208211e83115e6b2 Mon Sep 17 00:00:00 2001
From: Ramkumar Ramachandra <ramkumar.ramachandra at codasip.com>
Date: Fri, 29 Aug 2025 13:24:06 +0100
Subject: [PATCH] [LV] Use DenseMap::keys to improve code (NFC)

---
 llvm/lib/Transforms/Vectorize/LoopVectorize.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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()) &&