DWARF: debug_names: Don't emit entries for skeleton type units When a type unit is emitted, the CU referencing the type unit ends up with a little DW_TAG_*_type with the DW_AT_signature and DW_AT_declaration sometimes referred to (by me? maybe other people?) as a skeleton type. We shouldn't produce .debug_names reference to these - only to the actual type definition in the type unit. So this patch does that. But, inversely, the .debug_gnu_pubtypes /does/ need to reference the skeleton type (& gcc does this too, when it produces a skeleton type (gcc doesn't always produce these - if the type is only referenced once via DW_AT_type, gcc uses a direct DW_FORM_ref_sig8 on the DW_AT_type without the intermediate skeleton type)) - so there's a little special case added in to preserve that behavior which is covered by existing tests.
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