* symtab.c, symtab.h: Have a builtin_type_{,unsigned_}long_long

	* symtab.c, symtab.h: Have a builtin_type_{,unsigned_}long_long
	regardless of LONG_LONG.
	symtab.c, symtab.h (allocate_stub_method): New function.
	* symtab.c (decode_line_1): Deal with operators specified as
	"operator" <optional whitespace> <symbols for operator>.
	(operator_chars): Help do it.
	* symtab.c (lookup_struct_elt_type): Call check_stub_type.
	Take additional argument noerr.
	Don't dump core if TYPE_FIELD_NAME is NULL.
	Check the baseclasses recursively.