message: Fix OS/X compile error
diff: @@ -97,7 +97,8 @@ void KernelSupportLibrary::EmitAndCallOutlinedKernel(
  std::vector<llvm::Value*> arg_values;
  std::transform(function->arg_begin(), function->arg_end(),
  - std::back_inserter(arg_values), std::addressof<llvm::Value>);
  + std::back_inserter(arg_values),
  + [](llvm::Value& v) { return &v; });
  kernel_body_generator(arg_values);
  } else {
  VLOG(3) << "Re-using kernel for " << kernel_name;
  