[NFC] Initialize pointer field

[tahonermann]

Looks good to me. I see that OpenMPIRBuilder::emitTargetKernel() can return without having assigned the Return parameter.

[Manna]

Thank you @tahonermann for reviews and feedbacks.

llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp

OpenMPIRBuilder::InsertPointTy OpenMPIRBuilder::emitKernelLaunch(
   // compiler doesn't need to keep that, and could therefore inline the host
   // function if proven worthwhile during optimization.
 
   // From this point on, we need to have an ID of the target region defined.
   assert(OutlinedFnID && "Invalid outlined function ID!");
   (void)OutlinedFnID;
 
   // Return value of the runtime offloading call.
-  Value *Return;
+  Value *Return = nullptr;
 
   // Arguments for the target kernel.
   SmallVector<Value *> ArgsVector;
   getKernelArgsVector(Args, Builder, ArgsVector);
 
   // The target region is an outlined function launched by the runtime
   // via calls to __tgt_target_kernel().
   //