[clang] [memprof] Export __memprof_default_options_str on Darwin (PR #128920)

[Ellis Hoag via cfe-commits]

================
@@ -1617,6 +1617,10 @@ void DarwinClang::AddLinkRuntimeLibArgs(const ArgList 
&Args,
     }
   }
 
+  if (Sanitize.needsMemProfRt())
+    if (hasExportSymbolDirective(Args))
+      addExportedSymbol(CmdArgs, "___memprof_default_options_str");
----------------
ellishg wrote:

Yes, Darwin symbols are prefixed with `_`, so this is correct.

https://github.com/llvm/llvm-project/pull/128920
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