re PR debug/7081 (DWARF enhancements for C++)

re PR debug/7081 (DWARF enhancements for C++)

gcc/ChangeLog:
PR debug/7081
* dwarf2out.c (dwarf_tag_name): Synchronize with dwarf2.h.
(is_type_die): Cover interface types.
(class_or_namespace_scope_p): Cover interface and class types.
(record_type_tag): New.
(gen_inlined_structure_type_die): Use it.
(gen_struct_or_union_type_die): Likewise.
(prune_unused_types_walk): Cover interface types.
* langhooks.h (classify_record): New enum.
(classify_record): New member in struct langhooks_for_types.
* langhooks-def.h (LANG_HOOKS_CLASSIFY_RECORD): New.
(LANGHOOKS_FOR_TYPES_INITIALIZER): Adjust.
gcc/cp/ChangeLog:
PR debug/7081
* cp-lang.c (cp_classify_record): New.
(LANG_HOOKS_CLASSIFY_RECORD): Override.
gcc/java/ChangeLog:
PR debug/7081
* lang.c (java_classify_record): New.
(LANG_HOOKS_CLASSIFY_RECORD): Override.

From-SVN: r130960