message: Add an extra piece of trace
diff: @@ -149,6 +149,8 @@ StatusOr<std::unique_ptr<Executable>> PoplarCompiler::Compile(
  se::StreamExecutor* stream_exec) {
  TF_RET_CHECK(stream_exec != nullptr);
  + VLOG(1) << "Begin compilation of module " << hlo_module->name();
  +
  TF_RETURN_IF_ERROR(
  RunHloOptimization(hlo_module.get(), dump_hlo));
  @@ -195,7 +197,7 @@ StatusOr<std::unique_ptr<Executable>> PoplarCompiler::Compile(
  }
  }
  - VLOG(1) << "Compiling computation " << entry->name();
  + VLOG(1) << "Compiling main computation " << entry->name();
  // Visit the graph, building up a poplar equivalent
  EntryVisitor visitor(graph, resources, entry->num_parameters());
  