[turbofan] GraphBuilderTester uses --print-opt-code.

test/cctest/compiler/graph-builder-tester.h

Index: test/cctest/compiler/graph-builder-tester.h
diff --git a/test/cctest/compiler/graph-builder-tester.h b/test/cctest/compiler/graph-builder-tester.h
index 18b54f1e08484fac995c2e1ca7fbb81c05ca0a30..188a1c923e571c1f0b03074c884c9bce05d17ebf 100644
--- a/test/cctest/compiler/graph-builder-tester.h
+++ b/test/cctest/compiler/graph-builder-tester.h
@@ -274,6 +274,12 @@ class GraphBuilderTester : public HandleAndZoneScope,
       CallDescriptor* desc =
           Linkage::GetSimplifiedCDescriptor(zone, this->csig_);
       code_ = Pipeline::GenerateCodeForTesting(main_isolate(), desc, graph());
+#ifdef ENABLE_DISASSEMBLER
+      if (!code_.is_null() && FLAG_print_opt_code) {
+        OFStream os(stdout);
+        code_.ToHandleChecked()->Disassemble("test code", os);
+      }
+#endif
     }
     return code_.ToHandleChecked()->entry();
   }