on prmpt processing done, assert cache_tokens.size

Author: ngxson

tools/server/server.cpp

@@ -3256,6 +3256,8 @@ struct server_context {
 
                     // entire prompt has been processed
                     if (slot.n_past == slot.n_prompt_tokens) {
+                        GGML_ASSERT(slot.cache_tokens.size() == slot.prompt_tokens.size());
+
                         slot.state = SLOT_STATE_DONE_PROMPT;
 
                         GGML_ASSERT(batch.n_tokens > 0);