[clang] [Darwin][Driver] Avoid duplicate -lc++ with -fsanitize=fuzzer (PR #161304)

[Dan Blackwell via cfe-commits]

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@@ -1609,7 +1609,12 @@ void DarwinClang::AddLinkRuntimeLibArgs(const ArgList &Args,
     if (Sanitize.needsFuzzer() && !Args.hasArg(options::OPT_dynamiclib)) {
       AddLinkSanitizerLibArgs(Args, CmdArgs, "fuzzer", /*shared=*/false);
 
-        // Libfuzzer is written in C++ and requires libcxx.
+      // Libfuzzer is written in C++ and requires libcxx.
+      // Since darwin::Linker::ConstructJob already adds -l++ for clang++
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DanBlackwell wrote:

Should this be `lc++`?

https://github.com/llvm/llvm-project/pull/161304