message: [lldb] Remove unused variable.
  The use of this variable was removed in r338734. It now causes unused variable warnings.
diff: @@ -56,7 +56,6 @@ RegisterContextSP
  ThreadMinidump::CreateRegisterContextForFrame(StackFrame *frame) {
  RegisterContextSP reg_ctx_sp;
  uint32_t concrete_frame_idx = 0;
  - Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_THREAD));
  if (frame)
  concrete_frame_idx = frame->GetConcreteFrameIndex();
  