message: More explicit checks in main
  Summary:
  Add two explicit leak checks:
  * After instruction lowering
  * After dex writing
diff: #include "ReachableClasses.h"
  #include "RedexContext.h"
  #include "RedexResources.h"
  +#include "Sanitizers.h"
  #include "SanitizersConfig.h"
  #include "Show.h"
  #include "Timer.h"
  @@ -1094,6 +1095,8 @@ void redex_backend(ConfigFiles& conf,
  instruction_lowering::run(stores, lower_with_cfg);
  }
  + sanitizers::lsan_do_recoverable_leak_check();
  +
  TRACE(MAIN, 1, "Writing out new DexClasses...");
  const JsonWrapper& json_config = conf.get_json_config();
  @@ -1179,6 +1182,8 @@ void redex_backend(ConfigFiles& conf,
  }
  }
  + sanitizers::lsan_do_recoverable_leak_check();
  +
  std::vector<DexMethod*> needs_debug_line_mapping;
  if (post_lowering) {
  if (symbolicate_detached_methods) {
  