opencl: flush profiling batch at shutdown for incomplete batches (ggml-org#25016)

Author: shaofeiqi

ggml/src/ggml-opencl/ggml-opencl.cpp

@@ -850,6 +850,7 @@ struct ggml_backend_opencl_context {
         ref_count--;
         if (ref_count == 0) {
 #ifdef GGML_OPENCL_PROFILING
+            flush_profiling_batch();
             write_profiling_info();
             profiling_results.clear();
 #endif