Include <ctype.h>; avoid home-grown ISDIGIT.

Include <ctype.h>; avoid home-grown ISDIGIT.
(decl_attributes): Call record_function_format with DECL_NAME and also
DECL_ASSEMBLER_NAME.
(struct format_char_info): Moved here from c-typeck.c.
(print_char_table): Likewise; renamed from print_table.
(scan_char_table): Likewise; renamed from scan_table.
(struct function_format_info): Likewise; add assembler_name.
(function_format_list): Make list, not array.
(init_function_format_info): Likewise; renamed from init_format_info_table.
(record_function_format): Likewise; renamed from record_format_info;
record assembler_name.
(check_format_info): Likewise; renamed from check_format.
(check_function_format): New interface that does not require knowledge of
struct function_format_info.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@5607 138bc75d-0d04-0410-961f-82ee72b054a4