Lower for-loops over ranges to counting loops in IR#33
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Optimize lowering of for-loops with range iterators by generating counting loops instead of using the iterator protocol. Retain the iterator protocol for non-range iterators. Also fix conditional branching to avoid overwriting terminators after returns. Add UTF-8 console initialization for Windows in C backend.
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Optimize lowering of for-loops with range iterators by generating counting loops instead of using the iterator protocol. Retain the iterator protocol for non-range iterators. Also fix conditional branching to avoid overwriting terminators after returns. Add UTF-8 console initialization for Windows in C backend.