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4782a76bca
This removes unnecessary movn, movf, lds, and a few other instructions. Any instructions that has not side effects and writes to a slot that isn't used can be removed. A number of other optimizations can follow from this: - Implement the def-aliasing-var optimization better - This function can be iterated as a fix point until no more instructions are removed. - If we implement slot renaming, then we no longer need to free slots and can simplify the initial code generation a lot.