Test ppc-iwp2.2/amd2

PPC ppc-iwp2.2/amd2 (PPCiwpTwoTwo)
(* Same as d1 *)
{
 P0:r5=55; P1:r6=66; P0:r1=x; P1:r1=x; 
 P0:r2=y; P1:r2=y; x=0; y=0;
};
    P0           |   P1          ;
  lwz r6,0,r1      | lwz r5,0,r2 ;
  stw r5,0,r2      | stw r6,0,r1 ;

Observed
    0:r6=66; 1:r5=55;
<<
genprog generated/ppc-iwp2.2-amd2-prog.tex
essdump generated/ppc-iwp2.2-amd2-ess.dot
show 0
>>
<<
show 0
show interesting true
readfrom generated/ppc-iwp2.2-amd2-rf.dot
>>