message: TV: add a temporary fix for crashes due to wrong BB order
  will go away once CFG analysis is in place
  fixes
diff: @@ -441,6 +441,12 @@ public:
  Fn.addInput(move(val));
  }
  + // create all BBs upfront to keep LLVM's order
  + // FIXME: this can go away once we have CFG analysis
  + for (auto &bb : f) {
  + Fn.getBB(value_name(bb));
  + }
  +
  for (auto &bb : f) {
  auto &BB = Fn.getBB(value_name(bb));
  for (auto &i : bb) {
  