Llm runner msvc (pytorch#15250)

### Test plan
existing ci for no regression. Working on MSVC CI

Author: JacobSzwejbka

extension/llm/runner/text_llm_runner.cpp

@@ -116,8 +116,14 @@ Error TextLLMRunner::generate(
       /*bos=*/config.num_bos,
       /*eos=*/config.num_eos);
 
-  ET_CHECK_TK_OK_OR_RETURN_ERROR(
-      encode_res.error(), "Failed to encode prompt %s", prompt.c_str());
+  if (!encode_res.ok()) {
+    ET_LOG(
+        Error,
+        "Failed to encode prompt %s. Tokenizers error code %d",
+        prompt.c_str(),
+        static_cast<uint32_t>(encode_res.error()));
+    return Error::InvalidArgument;
+  }
 
   // encode the (string) prompt into tokens sequence
   std::vector<uint64_t> prompt_tokens = encode_res.get();
@@ -233,8 +239,10 @@ Error TextLLMRunner::generate(
 
 Error TextLLMRunner::warmup(const std::string& prompt, int32_t max_new_tokens) {
   // Create a GenerationConfig for warmup
-  GenerationConfig config{
-      .echo = false, .max_new_tokens = max_new_tokens, .warming = true};
+  GenerationConfig config;
+  config.echo = false;
+  config.max_new_tokens = max_new_tokens;
+  config.warming = true;
 
   // Call generate with the warmup config
   Error err = generate(prompt, config);