* class.c (check_field_decls): Only check C_TYPE_FIELDS_READONLY
for class types.
* cp-tree.h (C_TYPE_FIELDS_READONLY): Use a lang-specific bit
rather than TYPE_LANG_FLAG_0.
(TYPE_BUILT_IN): Remove.
(TYPE_DEPENDENT_P): New macro.
(TYPE_DEPENDENT_P_VALID): Likewise.
(lang_type_class): Add fields_readonly.
* decl.c (record_builtin_type): Don't set TYPE_BUILT_IN.
* pt.c (dependent_type_p_r): New function, split out from ...
(dependent_type_p): ... here. Memoize results.
* search.c (dependent_base_p): Use dependent_type_p, not
uses_template_parms.
* typeck.c (build_modify_expr): Only check C_TYPE_FIELDS_READONLY
for class types.
From-SVN: r62143
