[Driver] Do not use -fopenmp-new-driver by default

Author: mdtoguchi

clang/lib/Driver/Driver.cpp

@@ -6000,9 +6000,11 @@ void Driver::BuildActions(Compilation &C, DerivedArgList &Args,
 
   llvm::SmallVector<phases::ID, phases::MaxNumberOfPhases> PL;
 
+  // TODO: Do not use the new offloading driver at this time.  Offloading
+  // support for spir64 targets is not in place with this new path.
   bool UseNewOffloadingDriver =
       C.isOffloadingHostKind(Action::OFK_OpenMP) &&
-      !Args.hasArg(options::OPT_fno_openmp_new_driver);
+      Args.hasArg(options::OPT_fopenmp_new_driver);
 
   for (auto &I : Inputs) {
     types::ID InputType = I.first;