Cached operations propagate incorrectly in switch statements

[JeanJPNM]

Cached operations propagate incorreclty across switch case bodies. In the following example, it is visible in the output that
the results from the operations in the first case are being reused in the second, even though they will never be executed.

const x = Math.rand(10);
const y = Math.rand(2) > 1 ? 1 : 2;
switch (y) {
  case 1:
    print`${x + y} > ${x - y}`;
    break;
  case 2:
    print`${x - y} < ${x + y}`;
    break;
}

printFlush();

Output:

op rand x:1:6 10
op rand &t0 2
jump 5 lessThanEq &t0 1
set y:2:6 1
jump 6 always
set y:2:6 2
jump 9 strictEqual y:2:6 1
jump 15 strictEqual y:2:6 2
jump 18 always
op add &t1 x:1:6 y:2:6
op sub &t2 x:1:6 y:2:6
print &t1
print " > "
print &t2
jump 18 always
print &t2
print " < "
print &t1
printflush message1