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As mentioned in the PR, reusing a DW_TAG_subprogram DW_AT_declaration DIE for the definition doesn't work with -feliminate-dwarf2-dups or -gdwarf-4, there we really want to avoid DW_TAG_subprograms for actual routine definitions, otherwise we ICE because .debug_aranges isn't split to point to those units (but the comdat CUs don't seem to be meant to contain debug info for code).
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