WebAssembly: Avoid parsing -mllvm* command-line options if there aren't any

Author: kinke

wasm/Driver.cpp

@@ -225,7 +225,8 @@ void LinkerDriver::link(ArrayRef<const char *> ArgsArr) {
   V.push_back("wasm-ld (LLVM option parsing)");
   for (auto *Arg : Args.filtered(OPT_mllvm))
     V.push_back(Arg->getValue());
-  cl::ParseCommandLineOptions(V.size(), V.data());
+  if (V.size() > 1)
+    cl::ParseCommandLineOptions(V.size(), V.data());
 
   errorHandler().ErrorLimit = args::getInteger(Args, OPT_error_limit, 20);