Handle --version before handling --mllvm.

[ruiu]

Summary

Because there's no point to handle --mllvm before --version.

wasm/Driver.cpp

void LinkerDriver::link(ArrayRef<const char *> ArgsArr) {
   opt::InputArgList Args = Parser.parse(ArgsArr.slice(1));
 
   // Handle --help
   if (Args.hasArg(OPT_help)) {
     printHelp(ArgsArr[0]);
     return;
   }
 
+  // Handle --version
+  if (Args.hasArg(OPT_version) || Args.hasArg(OPT_v)) {
+    outs() << getLLDVersion() << "\n";
+    return;
+  }
+
   // Parse and evaluate -mllvm options.
   std::vector<const char *> V;
   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());
 
   errorHandler().ErrorLimit = args::getInteger(Args, OPT_error_limit, 20);
 
-  if (Args.hasArg(OPT_version) || Args.hasArg(OPT_v)) {
-    outs() << getLLDVersion() << "\n";
-    return;
-  }
-
   Config->AllowUndefined = Args.hasArg(OPT_allow_undefined);
   Config->CheckSignatures =
       Args.hasFlag(OPT_check_signatures, OPT_no_check_signatures, false);
   Config->Entry = getEntry(Args, Args.hasArg(OPT_relocatable) ? "" : "_start");
   Config->ImportMemory = Args.hasArg(OPT_import_memory);
   Config->OutputFile = Args.getLastArgValue(OPT_o);
   Config->Relocatable = Args.hasArg(OPT_relocatable);
   Config->GcSections =