The current implementation of APInt extension in the code can trigger an
assertion failure when the `zext` function is called with a target width
smaller than the current bit width. For example:
```cpp
if (InitNum.getBitWidth() != BoundNum.getBitWidth()) {
InitNum = InitNum.zext(BoundNum.getBitWidth());
BoundNum = BoundNum.zext(InitNum.getBitWidth());
}
```
This logic does not guarantee that the `zext` target width is always
greater than or equal to the current bit width, leading to potential
crashes.
Expected Behavior:
- Ensure InitNum and BoundNum are extended to the maximum of their respective widths.
- Prevent assertion failures by enforcing correct `zext` usage.
Fixes#121201
