a106a2e69d
This changes the shape of check_bounds to take a continuation to call if the bounds check succeeds. This is designed to allow for easily wrapping existing code with a bounds check, e.g.
```
void* memcpy(void* dest, const void* src, size_t n) {
return check_bounds(dest, n, [&] {
return memcpy_impl(dest, src, n);
});
}
```