[Bug]: Panic with iife format

### Reproduction link or steps

https://stackblitz.com/github/TheAlexLichter/rolldown-reproductions/tree/rolldown-panic-math-random

### What is expected?

No panic

### What is actually happening?

Panic

### System Info

```Shell
Stackblitz env
```

### Any additional comments?

Linking https://github.com/rolldown/rolldown/issues/1623