[llvm] [llvm-nm] Improve performance while faking symbols from function starts (PR #162755)

[Ellis Hoag via llvm-commits]

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@@ -1615,12 +1616,11 @@ static void dumpSymbolsFromDLInfoMachO(MachOObjectFile &MachO,
     }
     // See if these addresses are already in the symbol table.
     unsigned FunctionStartsAdded = 0;
+    SmallSet<uint64_t, 32> SymbolAddresses;
+    for (unsigned J = 0; J < SymbolList.size(); ++J)
+      SymbolAddresses.insert(SymbolList[J].Address);
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ellishg wrote:

```suggestion
    for (const auto &S : SymbolList)
      SymbolAddresses.insert(S.Address);
```

https://github.com/llvm/llvm-project/pull/162755