If function die_name() finds a DIE without a name, set its name to

"__anon__". This hack is used to workaround a issue that compilers
like GCC could generate DW_TAG_base_type DIE without a name.

Note that we didn't need this before because the old libdwarf
internally set all the unnamed DIE's name to "__anon__".

cddl/contrib/opensolaris/tools/ctf/cvt/dwarf.c

@@ -431,6 +431,8 @@ die_name(dwarf_t *dw, Dwarf_Die die)
 	char *str = NULL;
 
 	(void) die_string(dw, die, DW_AT_name, &str, 0);
+	if (str == NULL)
+		str = xstrdup("__anon__");
 
 	return (str);
 }