Test ppc-adir8

PPC ppc-adir8 (PPCAdirEight)
{
 P0:r10=1; P1:r10=1; P2:r11=2;
 P0:r5=x; P1:r5=x; P2:r5=x;
 P0:r6=y; P1:r6=y; 
 x = 0; y = 0;
}

    P0       |      P1    |      P2        ;
stw r10,0,r5 | stw r10,0,r6 | stw r11,0,r5 ;
sync         | sync         |              ;
lwz r1,0,r6  | lwz r2,0,r5  |              ;

Observed
    0:r1=0; 1:r2=2; x=1; y=1;
<<
genprog generated/ppc-adir8-prog.tex
show 0
essdump generated/ppc-adir8-ess.dot
>>
<<
show 0 of ess 0
show interesting true
readfrom generated/ppc-adir8-rf.dot
>>