[llvm] [Support] Avoid repeated hash lookups (NFC) (PR #129000)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/129000

None

>From 686d3f9576df55057706ca44475302c495637255 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Wed, 26 Feb 2025 09:12:49 -0800
Subject: [PATCH] [Support] Avoid repeated hash lookups (NFC)

---
 llvm/lib/Support/DAGDeltaAlgorithm.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Support/DAGDeltaAlgorithm.cpp b/llvm/lib/Support/DAGDeltaAlgorithm.cpp
index 8b23b05913291..48302b8cb0621 100644
--- a/llvm/lib/Support/DAGDeltaAlgorithm.cpp
+++ b/llvm/lib/Support/DAGDeltaAlgorithm.cpp
@@ -201,8 +201,9 @@ DAGDeltaAlgorithmImpl::DAGDeltaAlgorithmImpl(
     std::set<change_ty> &ChangeSuccs = SuccClosure[Change];
     for (pred_iterator_ty it = pred_begin(Change),
            ie = pred_end(Change); it != ie; ++it) {
-      SuccClosure[*it].insert(Change);
-      SuccClosure[*it].insert(ChangeSuccs.begin(), ChangeSuccs.end());
+      auto &SC = SuccClosure[*it];
+      SC.insert(Change);
+      SC.insert(ChangeSuccs.begin(), ChangeSuccs.end());
       Worklist.push_back(*it);
     }
   }