Test auto/LB-LRR+R-A+R-A+R-Oc+R-Oc

LISA auto/LB-LRR+R-A+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,LRR: Maybe->Sometimes: Control dependencies do not order trailing reads
 *)
{
 3:r4=1; 4:r4=1;
}
 P0              | P1               | P2               | P3                 | P4                 | P5           ;
 r[once] r1 u0   | r[acquire] r1 x1 | r[acquire] r1 x2 | r[once] r1 x3      | r[once] r1 x4      | w[once] u0 1 ;
 w[release] x1 1 | w[release] x2 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=1; 0:r1=1;