Test LxSxd2

AArch64 LxSxd2
{
  0:X1=x;
  0:X3=y;
}
  P0              ;
  LDXR W0,[X1]    ;
  MOV W2,#1       ;
  STXR W4,W2,[X3] ;
  MOV W6,#2       ;
  STXR W5,W6,[X3] ;

Observed
    y=1; 0:X5=1; 0:X4=0;