Test LB+dmb.sy+amo.swp-po-amo.ldadd

AArch64 LB+dmb.sy+amo.swp-po-amo.ldadd
"DMB.SYdRW Rfe Amo.Swp PodWR Amo.LdAdd Rfe"
Generator=diyone7 (version 7.56+02~dev)
Prefetch=0:x=F,0:y=W,1:y=F,1:x=W
Com=Rf Rf
Orig=DMB.SYdRW Rfe Amo.Swp PodWR Amo.LdAdd Rfe
{
0:X0=x; 0:X3=y;
1:X0=y; 1:X3=x;
}
 P0          | P1               ;
 LDR W1,[X0] | MOV W2,#2        ;
 DMB SY      | SWP W2,W1,[X0]   ;
 MOV W2,#1   | MOV W5,#1        ;
 STR W2,[X3] | LDADD W5,W4,[X3] ;
Observed
    y=2; 1:X4=0; 1:X1=1; 0:X1=1;