[PATCH] PR debug/16063. Add DW_AT_type to DW_TAG_enumeration.

[Cary Coutant]

> gcc/cp/
>         * dwarf2out.c (gen_enumeration_type_die): Add DW_AT_type if
>         enum_underlying_base_type defined and DWARF version > 3.
>         * langhooks.h (struct lang_hooks_for_types): Add
>         enum_underlying_base_type.
>         * langhooks-def.h (LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE): New define.
>         (LANG_HOOKS_FOR_TYPES_INITIALIZER): Add new lang hook.

This should be the ChangeLog entry for cp/cp-lang.c.

-cary