try_emplace

Author: usx95

clang/lib/Analysis/LifetimeSafety/LoanPropagation.cpp

@@ -27,7 +27,11 @@ static llvm::BitVector computePersistentOrigins(FactManager &FactMgr,
       auto CheckOrigin = [&](OriginID OID) {
         if (PersistentOrigins.test(OID.Value))
           return;
-        auto It = OriginToBlock.find(OID);
+        auto [It, Inserted] = OriginToBlock.try_emplace(OID, B);
+        if (!Inserted && It->second != B) {
+          // We saw this origin in more than one block.
+          PersistentOrigins.set(OID.Value);
+        }
         if (It == OriginToBlock.end())
           OriginToBlock[OID] = B;
         else if (It->second != B) {