[llvm] [Transforms][NFC] Tiny fixes in SplitModule (PR #95903)

[Pierre van Houtryve via llvm-commits]

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@@ -275,8 +278,8 @@ void llvm::SplitModule(
     ValueToValueMapTy VMap;
     std::unique_ptr<Module> MPart(
         CloneModule(M, VMap, [&](const GlobalValue *GV) {
-          if (ClusterIDMap.count(GV))
-            return (ClusterIDMap[GV] == I);
+          if (auto It = ClusterIDMap.find(GV); It != ClusterIDMap.end())
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Pierre-vh wrote:

I also use this pattern a lot and I think it's more readable than 2 separate line

https://github.com/llvm/llvm-project/pull/95903