Hojun-Cho
a5919ed8da
Extended cg_widen_tagged_store (cstage) / cgwidentaggedstore (wwstage) to take a base_reg/basereg parameter so the primitive supports non-BP destinations. Cstage extends body in-place via via_outer gate + spill+scratch+copy-out; wwstage splits into wrapper (non-BP) + cgwidentaggedstorebp (BP-only) to dodge the no-goto constraint. New N_ASSIGN field TY_TAGGED branch routes through the primitive for all rhs shapes. Scope-adjacent: fieldsize recurses through N_TTAGGED via slotsize and TNAME-aliased-to-tagged via aliaslookup. Needed for the test fixtures. Wwstage read-side N_DOT-of-tagged-field source is filed as task #28; test rows use mark-canary verification until that lands.