Test auto/LB-GWW+R-A

LISA auto/LB-GWW+R-A
(*
 * Result: Maybe
 * P0 GWW: Never->Maybe: Should rel-acq provide any global transitivity?
 *)
{
}
 P0              | P1               | P2            ;
 w[once] u0 3    | r[acquire] r1 x1 | r[once] r1 v0 ;
 w[release] x1 1 | w[once] v0 1     | f[mb]         ;
                 |                  | r[once] r2 u0 ;
Observed
    2:r2=0; 2:r1=1; 1:r1=1;