opensta, sdc_expand: mark as experimental

techlibs/common/opensta.cc

@@ -44,6 +44,7 @@ struct OpenstaPass : public Pass
 		bool cleanup = design->scratchpad_get_bool("opensta.cleanup", true);
 
 		log_header(design, "Executing OPENSTA pass.\n");
+		log_experimental("opensta");
 		log_push();
 
 		size_t argidx;

techlibs/common/sdc_expand.cc

@@ -37,6 +37,7 @@ struct SdcExpandPass : public ScriptPass
 	void execute(std::vector<std::string> args, RTLIL::Design *design) override
 	{
 		log_header(design, "Executing SDC_EXPAND pass.\n");
+		log_experimental("sdc_expand");
 		string run_from, run_to;
 		opensta_exe = "";
 		cleanup = design->scratchpad_get_bool("sdc_expand.cleanup", true);