[!315] Fix opcounter bug in google-benchmark autotuning

Merge branch 'fix/benchmark-opcounting' into 'master'

See merge request [extensions/dune-codegen!315]

  [extensions/dune-codegen!315]: Noneextensions/dune-codegen/merge_requests/315

python/dune/codegen/sumfact/autotune.py

@@ -212,7 +212,7 @@ def generate_standalone_code_google_benchmark(sf, filename):
         f.write("\n\n")
         f.write("static void BM_sumfact_kernel(benchmark::State& state){\n")
 
-    write_setup_code(sf, filename, define_thetas=False)
+    opcounting = write_setup_code(sf, filename, define_thetas=False)
 
     additional_arguments = [i.split()[-1] for i in sf.interface.signature_args]
     additional_arguments = ', '.join(additional_arguments)
@@ -227,6 +227,7 @@ def generate_standalone_code_google_benchmark(sf, filename):
                       "\n",
                       "BENCHMARK_MAIN();"
                       ])
+    set_option("opcounter", opcounting)
 
 
 def generate_standalone_code(sf, filename):