### What this PR does / why we need it? Previously, the dummy run executed compute_logits only once, regardless of num_speculative_tokens. This caused execute_model to hang on compute_logits when lm head tensor parallelism exceeded 1. The fix ensures compute_logits executes correctly during dummy run, matching num_speculative_tokens. Signed-off-by: zouyida2052 <zouyida2002@gmail.com>