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This commit uses parameter packs to sink `debug_item()` construction into the `debug_info()`-specific `add()` overload. This makes the stack space use sub-linear in typical case rather than linear (which is still the worst case). Oddly, the stack slots that get allocated now are all for the `0` literal for `lsb_offset`. This could be fixed by allocating numbers statically but the existing reduction in stack use of ~98% for a representative example (Minerva SoC) should be enough.