[llvm] Make llvm-nm's --export-symbols option work for ELF (PR #84379)

[Fangrui Song via llvm-commits]

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@@ -777,7 +778,7 @@ static void printSymbolList(SymbolicFile &Obj,
   }
 
   for (const NMSymbol &S : SymbolList) {
-    if (!S.shouldPrint())
+    if (!S.shouldPrint(false /*OnlyExported*/))
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MaskRay wrote:

canonical style: `/*OnlyExported=*/false`

https://github.com/llvm/llvm-project/pull/84379