[Clang] Do not build the OffloadActionBuilder when using the new driver

The Offloading toolchain currently has two methods for construction the
requires actions. The "new" driver and the old `OffloadActionBuilder`.
Using either one is mutually exclusive, so we should not initialize this
when using the new driver. This was causing some error messages to be
printed multiple times because we were checking them in both the old and
the new driver.

Reviewed By: tra

Differential Revision: https://reviews.llvm.org/D135715

Author: jhuber6

clang/lib/Driver/Driver.cpp

@@ -3952,14 +3952,17 @@ void Driver::BuildActions(Compilation &C, DerivedArgList &Args,
 
   handleArguments(C, Args, Inputs, Actions);
 
-  // Builder to be used to build offloading actions.
-  OffloadingActionBuilder OffloadBuilder(C, Args, Inputs);
-
   bool UseNewOffloadingDriver =
       C.isOffloadingHostKind(Action::OFK_OpenMP) ||
       Args.hasFlag(options::OPT_offload_new_driver,
                    options::OPT_no_offload_new_driver, false);
 
+  // Builder to be used to build offloading actions.
+  std::unique_ptr<OffloadingActionBuilder> OffloadBuilder =
+      !UseNewOffloadingDriver
+          ? std::make_unique<OffloadingActionBuilder>(C, Args, Inputs)
+          : nullptr;
+
   // Construct the actions to perform.
   HeaderModulePrecompileJobAction *HeaderModuleAction = nullptr;
   ExtractAPIJobAction *ExtractAPIAction = nullptr;
@@ -3982,14 +3985,14 @@ void Driver::BuildActions(Compilation &C, DerivedArgList &Args,
     // Use the current host action in any of the offloading actions, if
     // required.
     if (!UseNewOffloadingDriver)
-      if (OffloadBuilder.addHostDependenceToDeviceActions(Current, InputArg))
+      if (OffloadBuilder->addHostDependenceToDeviceActions(Current, InputArg))
         break;
 
     for (phases::ID Phase : PL) {
 
       // Add any offload action the host action depends on.
       if (!UseNewOffloadingDriver)
-        Current = OffloadBuilder.addDeviceDependencesToHostAction(
+        Current = OffloadBuilder->addDeviceDependencesToHostAction(
             Current, InputArg, Phase, PL.back(), FullPL);
       if (!Current)
         break;
@@ -4052,7 +4055,7 @@ void Driver::BuildActions(Compilation &C, DerivedArgList &Args,
       // Use the current host action in any of the offloading actions, if
       // required.
       if (!UseNewOffloadingDriver)
-        if (OffloadBuilder.addHostDependenceToDeviceActions(Current, InputArg))
+        if (OffloadBuilder->addHostDependenceToDeviceActions(Current, InputArg))
           break;
 
       // Try to build the offloading actions and add the result as a dependency
@@ -4070,7 +4073,7 @@ void Driver::BuildActions(Compilation &C, DerivedArgList &Args,
 
     // Add any top level actions generated for offloading.
     if (!UseNewOffloadingDriver)
-      OffloadBuilder.appendTopLevelActions(Actions, Current, InputArg);
+      OffloadBuilder->appendTopLevelActions(Actions, Current, InputArg);
     else if (Current)
       Current->propagateHostOffloadInfo(C.getActiveOffloadKinds(),
                                         /*BoundArch=*/nullptr);
@@ -4082,12 +4085,12 @@ void Driver::BuildActions(Compilation &C, DerivedArgList &Args,
     Arg *FinalPhaseArg;
     if (getFinalPhase(Args, &FinalPhaseArg) == phases::Link)
       if (!UseNewOffloadingDriver)
-        OffloadBuilder.appendDeviceLinkActions(Actions);
+        OffloadBuilder->appendDeviceLinkActions(Actions);
   }
 
   if (!LinkerInputs.empty()) {
     if (!UseNewOffloadingDriver)
-      if (Action *Wrapper = OffloadBuilder.makeHostLinkAction())
+      if (Action *Wrapper = OffloadBuilder->makeHostLinkAction())
         LinkerInputs.push_back(Wrapper);
     Action *LA;
     // Check if this Linker Job should emit a static library.
@@ -4102,7 +4105,7 @@ void Driver::BuildActions(Compilation &C, DerivedArgList &Args,
       LA = C.MakeAction<LinkJobAction>(LinkerInputs, types::TY_Image);
     }
     if (!UseNewOffloadingDriver)
-      LA = OffloadBuilder.processHostLinkAction(LA);
+      LA = OffloadBuilder->processHostLinkAction(LA);
     Actions.push_back(LA);
   }