message: [XLA:GPU] Add VLOG to ForThunk.
diff: @@ -43,6 +43,8 @@ Status ForThunk::Initialize(const GpuExecutable& executable,
  Status ForThunk::ExecuteOnStream(const BufferAllocations& buffer_allocations,
  se::Stream* stream,
  HloExecutionProfiler* profiler) {
  + VLOG(2) << "Executing ForThunk with " << loop_limit_ << " iters for "
  + << (hlo_instruction() ? hlo_instruction()->ToString() : "<null>");
  auto op_profiler = profiler->MakeScopedInstructionProfiler(hlo_instruction());
  for (int64 i = 0; i < loop_limit_; ++i) {
  profiler->StartHloComputation();
  