Amaranth bitwise negation `~` compiles to Python bitwise negation `~` in
simulation; the same holds for comparison operators such as `==`. Thus
an expression such as `~(a == b)` in simulation will compile to Python
that takes the bitwise negation of the comparison result, which will be
an actual bool.
On 3.12, the result is a `DeprecationWarning` emitted only at simulation
run-time.
When negating in simulation, coerce the value to an int. `mask` is
sufficient as we do no further arithmetic here.
4ec9cbbffe