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bd23f78f2f
Custom lower and widen odd sized loads up to the alignment. The default set of legalization actions doesn't have a way to represent this. This fixes naturally aligned <3 x s8> and <3 x s16> loads. This also starts moving towards eliminating the buggy and overcomplicated legalization rules for narrowing. All the memory size changes should be done in the lower or custom action, not NarrowScalar / FewerElements. These currently have redundant and ambiguous code with the lower action.
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