Improve C++ brainfuck test (#351)
Improve C++ brainfuck test (#351)

* Improve C++ brainfuck test

- Use 'if' instead of 'while' in move function. That condition cannot be
true more than once. This is also the same as in Rust code.
- Add constness where possible.
- Initialize all fields in initialization lists (suggested by -Weffc++)
- Remove unused header file
- Fix typos

This change makes up for around 5% improvement in brainfuck mandel.

Signed-off-by: Radek Szymanski <4e492935a33b356914fe5fcd1d49bf6d2e501e33@pm.me>

* Address comments from review

Signed-off-by: Radek Szymanski <4e492935a33b356914fe5fcd1d49bf6d2e501e33@pm.me>
kostya/benchmarks,kostya/benchmarks,kostya/benchmarks,kostya/benchmarks,kostya/benchmarks,kostya/benchmarks,kostya/benchmarks,kostya/benchmarks,kostya/benchmarks,kostya/benchmarks,kostya/benchmarks,kostya/benchmarks,kostya/benchmarks,kostya/benchmarks