### What this PR does / why we need it?
It is confirmed that `num_input_tokens` must be assigned the value of
`maybe_padded_num_tokens` under all circumstances.
### Does this PR introduce _any_ user-facing change?
None.
### How was this patch tested?
Waiting for daily test for TorchAir.
- vLLM version: v0.10.1.1
- vLLM main:
006477e60b
Signed-off-by: Yizhou Liu <liu_yizhou@outlook.com>