5.031004
cop_fetch_label                # U (Perl_cop_fetch_label)
cop_store_label                # U (Perl_cop_store_label)
sv_2pvbyte_flags               # U
sv_2pvutf8_flags               # U
sv_nolocking                   # U (Perl_sv_nolocking)
SvPVbyte_nomg                  # U
SvPVbyte_or_null               # U
SvPVbyte_or_null_nomg          # U
SvPVutf8_nomg                  # U
SvPVutf8_or_null               # U
SvPVutf8_or_null_nomg          # U
sv_utf8_downgrade_flags        # U
sv_utf8_downgrade_nomg         # U