message: parallelize
  Summary: This is a behavior-preserving change.
diff: @@ -112,11 +112,13 @@ bool StripDebugInfo::should_drop_for_synth(const DexMethod* method) const {
  }
  Stats StripDebugInfo::run(const Scope& scope) {
  - Stats stats;
  - walk::code(scope, [&](DexMethod* meth, IRCode& code) {
  - stats += run(code, should_drop_for_synth(meth));
  + return walk::parallel::methods<Stats>(scope, [&](DexMethod* meth) {
  + auto code = meth->get_code();
  + if (!code) {
  + return Stats();
  + }
  + return run(*code, should_drop_for_synth(meth));
  });
  - return stats;
  }
  Stats StripDebugInfo::run(IRCode& code, bool should_drop_synth) {
  