Test CO-MIXED-20cc

Executions for behaviour: "0:X2=0x2222222211111111 ; x=0x2222222222222222"

AArch64 CO-MIXED-20cc
"Coherence test, mixed-size accesses"

{
uint64_t x = 0;
uint64_t 0:X2 = 0;
0:X5 = x;
1:X5 = x;
0:X1 = 0x11111111;
uint64_t 1:X1 = 0x2222222222222222;
}

P0                          | P1                          ;
STR  W1,[X5] (* Wx=(_,1) *) | STR  X1,[X5] (* Wx=(2,2) *) ;
LDR  X2,[X5] (* Rx=(2,1) *) |                             ;

Observed
    x=0x2222222222222222; 0:X2=0x2222222211111111;