perf(interpreter): don't check host value if unnecessary

GitOrigin-RevId: 5306c71328d10cbb9335cdf2b5765f7dbf0023d9

imperative/src/impl/interpreter/interpreter_impl.cpp

@@ -935,13 +935,14 @@ TensorPtr ChannelImpl::wait_tensor(TensorInfo* info, TensorProp prop) {
     MGB_RECORD_EVENT(TensorWaitPropEvent, info->id, m_waitee_id, prop);
     bool require_host = prop == TensorProp::HostValue;
     auto host_available = [&] { return info->ptr && info->ptr->value_fetched(); };
-    bool wait_host = !host_available();
-    if (require_host && wait_host) {
+    bool wait_host = false;
+    if (require_host && !host_available()) {
         // avoid dead lock
         lock.unlock();
         m_buffer.enqueue(GetValue{info});
         m_buffer.flush();
         lock.lock();
+        wait_host = true;
     }
     m_cv.wait(lock, [&]() {
         check_worker_exc_unsafe();
@@ -949,7 +950,7 @@ TensorPtr ChannelImpl::wait_tensor(TensorInfo* info, TensorProp prop) {
     });
     MGB_RECORD_EVENT(TensorWaitPropFinishEvent, info->id, m_waitee_id, prop);
     m_waitee = nullptr;
-    if (require_host && wait_host) {
+    if (wait_host) {
         auto err = info->ptr->comp_node().check_async_error();
         mgb_assert(!err, "%s", err->what());
     }