[NFC][OpenMP] Fix compile warnings introduced by D134396

Author: shiltian

Diff for: openmp/libomptarget/plugins-nextgen/common/PluginInterface/GlobalHandler.h

@@ -27,7 +27,7 @@ namespace omp {
 namespace target {
 namespace plugin {
 
-struct DeviceImageTy;
+class DeviceImageTy;
 struct GenericDeviceTy;
 
 using namespace llvm::object;

Diff for: openmp/libomptarget/plugins-nextgen/common/PluginInterface/PluginInterface.cpp

@@ -63,7 +63,8 @@ Error GenericKernelTy::launch(GenericDeviceTy &GenericDevice, void **ArgPtrs,
       getNumBlocks(GenericDevice, NumTeamsClause, LoopTripCount, NumThreads);
 
   INFO(OMP_INFOTYPE_PLUGIN_KERNEL, GenericDevice.getDeviceId(),
-       "Launching kernel %s with %d blocks and %d threads in %s mode\n",
+       "Launching kernel %s with %" PRIu64
+       " blocks and %d threads in %s mode\n",
        getName(), NumBlocks, NumThreads, getExecutionModeName());
 
   return launchImpl(GenericDevice, NumThreads, NumBlocks, DynamicMemorySize,