* mdebugread.c (parse_symbol): Don't call ecoff_swap_tir_in or
ecoff_swap_rndx_in directly; use the debug_swap pointer instead.
(upgrade_type, handle_psymbol_enumerators): Likewise.
(has_opaque_xref, cross_ref): Likewise.
(elfmdebug_build_psymtabs): Call swap->read_debug_info to read
debugging information, rather than doing it here.
* mipsread.c (mipscoff_symfile_read): Call read_debug_info entry
point in ecoff_debug_swap backend structure, rather than calling
ecoff_slurp_symbolic_info directly.