[OMPIRBuilder] Don't drop debug loc from LocationDescription.

LocationDescription contains both the instruction pointer and the debug location. When LocationDescription is available, it is better to use updateToLocation which will update both then restoreIP(Loc.IP) which may not. I am not checking the return value of updateToLocation because that is checked just a few lines above in all cases and we would have returned early if it failed.

Author: abidh

llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp

@@ -1161,7 +1161,7 @@ OpenMPIRBuilder::InsertPointTy OpenMPIRBuilder::emitTargetKernel(
  Builder.restoreIP(AllocaIP);
  auto *KernelArgsPtr =
  Builder.CreateAlloca(OpenMPIRBuilder::KernelArgs, nullptr, "kernel_args");
- Builder.restoreIP(Loc.IP);
+ updateToLocation(Loc);
 
  for (unsigned I = 0, Size = KernelArgs.size(); I != Size; ++I) {
  llvm::Value *Arg =
@@ -1189,7 +1189,6 @@ OpenMPIRBuilder::InsertPointOrErrorTy OpenMPIRBuilder::emitKernelLaunch(
  if (!updateToLocation(Loc))
  return Loc.IP;
 
- Builder.restoreIP(Loc.IP);
  // On top of the arrays that were filled up, the target offloading call
  // takes as arguments the device id as well as the host pointer. The host
  // pointer is used by the runtime library to identify the current target
@@ -5934,7 +5933,7 @@ OpenMPIRBuilder::createOrderedDepend(const LocationDescription &Loc,
  Builder.restoreIP(AllocaIP);
  AllocaInst *ArgsBase = Builder.CreateAlloca(ArrI64Ty, nullptr, Name);
  ArgsBase->setAlignment(Align(8));
- Builder.restoreIP(Loc.IP);
+ updateToLocation(Loc);
 
  // Store the index value with offset in depend vector.
  for (unsigned I = 0; I < NumLoops; ++I) {
@@ -8060,7 +8059,7 @@ void OpenMPIRBuilder::createMapperAllocas(const LocationDescription &Loc,
  ".offload_ptrs");
  AllocaInst *ArgSizes = Builder.CreateAlloca(
  ArrI64Ty, /* ArraySize = */ nullptr, ".offload_sizes");
- Builder.restoreIP(Loc.IP);
+ updateToLocation(Loc);
  MapperAllocas.ArgsBase = ArgsBase;
  MapperAllocas.Args = Args;
  MapperAllocas.ArgSizes = ArgSizes;