Optimization unreachable code elimination#42
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In this issue we added 2 further optimization, the unreachable code elimination and the copy propagation. Based on the book, we implemented transfer function, meet operator and the rewriting process at the end. Same with Unreachable code elimination, it was done in three passes, remove useless blocks, remove useless jumps and remove useless labels. At the end we deleted any resulting empty blocks. We added accordingly tests for both optimizations.
closes #41