[RFC/RFA] redesign construction of the automaton for a regex

[Paolo Bonzini]

> *** orig/lib/regex.c
> --- mod/lib/regex.c
> ***************
> *** 80,85 ****
> --- 80,87 ----
>      #undefs RE_DUP_MAX and sets it to the right value.  */
>   #include <limits.h>
>   
> + #define DEBUG 1
> + 
>   #include <regex.h>
>   #include "regex_internal.h"

Extraneous hunk (though it shows that my tests were stricter than normal :-)

Paolo