Revert "Runner logs (#15279)" (#15362)

This reverts commit 8ce3095.

### Summary
[PLEASE REMOVE] See [CONTRIBUTING.md's Pull
Requests](https://github.com/pytorch/executorch/blob/main/CONTRIBUTING.md#pull-requests)
for ExecuTorch PR guidelines.

[PLEASE REMOVE] If this PR closes an issue, please add a `Fixes
#<issue-id>` line.

[PLEASE REMOVE] If this PR introduces a fix or feature that should be
the upcoming release notes, please add a "Release notes: <area>" label.
For a list of available release notes labels, check out
[CONTRIBUTING.md's Pull
Requests](https://github.com/pytorch/executorch/blob/main/CONTRIBUTING.md#pull-requests).

### Test plan
[PLEASE REMOVE] How did you test this PR? Please write down any manual
commands you used and note down tests that you have written if
applicable.

Author: lucylq

extension/llm/runner/text_llm_runner.cpp

@@ -175,11 +175,6 @@ Error TextLLMRunner::generate(
   stats_->first_token_ms = time_in_ms();
   stats_->prompt_eval_end_ms = time_in_ms();
 
-  RUNNER_ET_LOG(
-      config.warming,
-      "RSS after prompt prefill: %f MiB (0 if unsupported)",
-      get_rss_bytes() / 1024.0 / 1024.0);
-
   // print the first token from prefill. No prev_token so use cur_token for it.
   auto decode_result = tokenizer_->decode(cur_token, cur_token);
   if (!decode_result.ok()) {
@@ -190,6 +185,10 @@ Error TextLLMRunner::generate(
     return ::executorch::runtime::Error::InvalidArgument;
   }
   wrapped_callback(std::move(*decode_result));
+  RUNNER_ET_LOG(
+      config.warming,
+      "RSS after prompt prefill: %f MiB (0 if unsupported)",
+      get_rss_bytes() / 1024.0 / 1024.0);
 
   // start the main loop
   prompt_tokens.push_back(cur_token);

extension/llm/runner/text_token_generator.h

@@ -128,13 +128,9 @@ class ET_EXPERIMENTAL TextTokenGenerator {
       if (eos_ids_->find(cur_token) != eos_ids_->end()) {
         printf("\n");
         ET_LOG(Info, "\nReached to the end of generation");
-        return pos - start_pos;
+        break;
       }
     }
-    ET_LOG(
-        Info,
-        "\nFinished generation. Generated %" PRIi32 " tokens.",
-        start_pos + max_new_tokens);
     return pos - start_pos;
   }