message: Make ResolveRefsPass required
  Summary: ResolveRefs is required. It aligns and removes all pure refs. Many passes assume that for their input. So we should emit the trait that it's required.
diff: @@ -42,6 +42,7 @@ class ResolveRefsPass : public Pass {
  "Convert invoke-super calls to invoke-virtual where possible");
  bind("excluded_externals", {}, m_excluded_externals,
  "Externals types/prefixes excluded from reference resolution");
  + trait(Traits::Pass::atleast, 1);
  }
  void eval_pass(DexStoresVector&, ConfigFiles&, PassManager&) override;
  