message: Updating GraphQL safe-to-merge list
  Summary:
  Fix the QueryString model. See
  Update `const_class_safe_types` list to merge more GraphService fragment model classes
diff: @@ -174,10 +174,8 @@ TypeSet MergeabilityChecker::exclude_unsupported_bytecode_refs_for(
  break;
  }
  if (!use_insn->has_method()) {
  - TRACE(CLMG,
  - 5,
  - "[non mergeable] const class unsafe use %s",
  - SHOW(use_insn));
  + TRACE(CLMG, 5, "[non mergeable] const class unsafe use @ %s in %s",
  + SHOW(use_insn), SHOW(method));
  non_mergeables.insert(referenced_type);
  break;
  }
  