search.c (maybe_suppress_debug_info): Don't check CLASSTYPE_INTERFACE_ONLY if CLASSTYPE_INTERFACE_KNOWN isn't set.

        * search.c (maybe_suppress_debug_info): Don't check
        CLASSTYPE_INTERFACE_ONLY if CLASSTYPE_INTERFACE_KNOWN isn't set.

        * pt.c (mark_decl_instantiated): Do SET_DECL_EXPLICIT_INSTANTIATION
        here if extern_p.

        Remember instantiation context in deferred instantiations.
        * cp-tree.h (struct tinst_level): Remove.
        (TINST_DECL, TINST_LINE, TINST_FILE): New macros.
        * pt.c (current_tinst_level): Now a tree.
        (print_template_context, push_tinst_level, pop_tinst_level,
        tinst_for_decl): Adjust.
        (reopen_tinst_level): New fn.
        (init_pt): Register current_tinst_level as a root.
        (add_pending_template): Put current_tinst_level in TREE_PURPOSE
        of the pending templates list.
        (instantiate_pending_templates): Adjust.  Call reopen_tinst_level.
        * lex.c (extract_interface_info): Adjust.
        * decl2.c (warn_if_unknown_interface): Adjust.

From-SVN: r34415