[bug] Cached operations propagate incorrectly in ternary expressions

[JeanJPNM]

The following example shows that the operation a + 1 is reused on the alternate branch, even though it
can only be executed in the consequent branch.

const a = Math.rand(10)
const b = a > 5 ? (a + 1) * 2 : (a + 1) * 3

Output:

op rand a:1:6 10
jump 5 lessThanEq a:1:6 5
op add &t0 a:1:6 1
op mul b:2:6 &t0 2
jump 6 always
op mul b:2:6 &t0 3
end

Version: latest (a9676c1)
Similar to #144.