message: Do not trace into fused computations when looking for call targets
diff: @@ -208,11 +208,13 @@ public:
  private:
  void CallSiteFound(HloComputation* comp, int count) {
  + if (comp->name().substr(0,8) != "_pop_op_") {
  if (done.find(comp) == done.end()) {
  todo.insert(comp);
  }
  targets[comp] += count;
  }
  + }
  std::set<HloComputation*> todo;
  std::set<HloComputation*> done;
  @@ -295,6 +297,8 @@ StatusOr<std::unique_ptr<Executable>> PoplarCompiler::Compile(
  // If this computation is a target of a call or while then compile
  // it and store in compiler resources
  VLOG(1) << "Compiling sub-computation " << comp->name();
  + XLA_VLOG_LINES(1, comp->ToString());
  +
  resources.computation_map.emplace(
  std::piecewise_construct,
  std::forward_as_tuple(comp),
  