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

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-support

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/129000.diff


1 Files Affected:

- (modified) llvm/lib/Support/DAGDeltaAlgorithm.cpp (+3-2) 


``````````diff
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);
     }
   }

``````````

</details>


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