Test auto/LB-LWR+R-Dd+R-A+R-Oc+R-Oc

LISA auto/LB-LWR+R-Dd+R-A+R-Oc+R-Oc
(*
 * Result: Sometimes
 * P2-P3 rf R-Oc: Never->Maybe: Note lack of C11 guarantee, control dependency
 * P3 Oc,R: Note lack of C11 guarantee
 * P3-P4 rf R-Oc: Note lack of C11 guarantee, control dependency
 * P4 Oc,LWR: Maybe->Sometimes: Control dependencies do not order trailing reads
 *)
{
 0:r3=x2; x1=y1; 3:r4=1; 4:r4=1;
}
 P0               | P1              | P2               | P3                 | P4                 ;
 w[once] u0 3     | r[deref] r1 x1  | r[acquire] r1 x2 | r[once] r1 x3      | r[once] r1 x4      ;
 w[release] x1 r3 | w[release] r1 1 | w[release] x3 1  | mov r4 (neq r1 r4) | mov r4 (neq r1 r4) ;
                  |                 |                  | b[] r4 CTRL3       | b[] r4 CTRL4       ;
                  |                 |                  | w[release] x4 1    | r[once] r2 u0      ;
                  |                 |                  | CTRL3:             | CTRL4:             ;
Observed
    4:r2=0; 4:r1=1; 3:r1=1; 2:r1=1; 1:r1=x2;