Eugene Kosov e5f99a0c0c MDEV-20297 Support C++11 range-based for loop for List<T> ...

New iterator has the fastest possible implementation: just moves one pointer.
It's faster that List_iterator and List_iterator_fast: both do more on increment.

Overall patch brings:
1) work compile times
2) possibly(!) worse debug build performance
3) definitely better optimized build performance
4) ability to write less code
5) ability to write less bug-prone code

2019-11-12 17:48:14 +07:00

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