[llvm] [Analysis] Avoid repeated hash lookups (NFC) (PR #126402)

[Nikita Popov via llvm-commits]

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@@ -241,8 +241,8 @@ template <class G> void AbstractDependenceGraphBuilder<G>::createDefUseEdges() {
         if (!UI)
           continue;
         NodeType *DstNode = nullptr;
-        if (IMap.find(UI) != IMap.end())
-          DstNode = IMap.find(UI)->second;
+        if (auto It = IMap.find(UI); It != IMap.end())
+          DstNode = It->second;
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nikic wrote:

Use lookup()?

https://github.com/llvm/llvm-project/pull/126402