[llvm] [CanonicalizeFreezeInLoops] fix duplicate removal (PR #74716)

[Wei Tao via llvm-commits]

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@@ -151,11 +151,18 @@ bool CanonicalizeFreezeInLoopsImpl::run() {
       }
     }
 
+    bool Exist = false;
     auto Visit = [&](User *U) {
       if (auto *FI = dyn_cast<FreezeInst>(U)) {
-        LLVM_DEBUG(dbgs() << "canonfr: found: " << *FI << "\n");
-        Info.FI = FI;
-        Candidates.push_back(Info);
+        for (const auto &Candidate : Candidates) {
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Friedrich20 wrote:

The fix has been refactored by using SmallSetVector.
Thanks for the example that really helps a lot!

https://github.com/llvm/llvm-project/pull/74716