For normal stack slots this would just be some extra code in cg_clif. For register spill stack slots it would require a Cranelift pass to run after regalloc has created register spill slots. For registers there may need to be a new instruction to zero a specific register, or the Cranelift pass can add iconst/fconst/vconst instructions with specific registers for their SSA values after DCE has run. I also assume that the flags register will need to be cleared (new instruction) All together it should not be too hard to add this to Cranelift.
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