Function arcSafeRelease

Bcore/src/main/cpp/Dobby/tests/catch.hpp:726–728

#if !CATCH_ARC_ENABLED
inline void arcSafeRelease(NSObject *obj) {
  [obj release];
}
inline id performOptionalSelector(id obj, SEL sel) {
  if ([obj respondsToSelector:sel])
    return [obj performSelector:sel];