I think it's fine to remove it and just leave a comment about the value being reserved.
- [PATCH] dwarf.h: Remove non-existing DW_TAG_mutable_type. Mark Wielaard
- Re: [PATCH] dwarf.h: Remove non-existing DW_TAG_mutabl... Josh Stone
- Re: [PATCH] dwarf.h: Remove non-existing DW_TAG_mu... Mark Wielaard
- Re: [PATCH] dwarf.h: Remove non-existing DW_TA... Josh Stone
- Re: [PATCH] dwarf.h: Remove non-existing D... Mark Wielaard
- Re: [PATCH] dwarf.h: Remove non-exist... Mark Wielaard
- Re: [PATCH] dwarf.h: Remove non-existing DW_TA... Roland McGrath
