stop generating -- for llvm.llink, just like amd-staging now

Author: ronlieb

flang-legacy/17.0-4/llvm-legacy/clang/lib/Driver/ToolChains/Clang.cpp

@@ -9203,7 +9203,6 @@ void LinkerWrapper::ConstructJob(Compilation &C, const JobAction &JA,
   // Add the linker arguments to be forwarded by the wrapper.
   CmdArgs.push_back(Args.MakeArgString(Twine("--linker-path=") +
                                        LinkCommand->getExecutable()));
-  CmdArgs.push_back("--");
   for (const char *LinkArg : LinkCommand->getArguments())
     CmdArgs.push_back(LinkArg);