message: parallelize ConstPropV3
  Summary: fastflash
diff: #include "DexUtil.h"
  #include "GlobalConstProp.h"
  #include "LocalConstProp.h"
  -#include "Walkers.h"
  +#include "ParallelWalkers.h"
  using std::placeholders::_1;
  using std::string;
  @@ -116,7 +116,7 @@ void ConstantPropagationPassV3::run_pass(DexStoresVector& stores,
  PassManager& mgr) {
  auto scope = build_class_scope(stores);
  - walk_methods(scope, [&](DexMethod* method) {
  + walk_methods_parallel_simple(scope, [&](DexMethod* method) {
  if (!method->get_code()) {
  return;
  }
  