PR c++/7228

    PR c++/7228
        * cp-tree.h (CLASSTYPE_READONLY_FIELDS_NEED_INIT): Check that
        lang_type structure exists before accessing field.
        (SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT): New macro.
        (CLASSTYPE_REF_FIELDS_NEED_INIT): Similar.
        (SET_CLASSTYPE_REF_FIELDS_NEED_INIT): New macro.
        * class.c (check_field_decls): Use new macros.
        * typeck2.c (process_init_constructor): Remove redundant check for
        existence of lang_type structure.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@58532 138bc75d-0d04-0410-961f-82ee72b054a4