Drop experimental label off synth -hieropt

Author: povik

techlibs/common/synth.cc

@@ -50,7 +50,7 @@ struct SynthPass : public ScriptPass {
 		log("    -hieropt\n");
 		log("        enable hierarchical optimization. this option is useful when `-flatten'\n");
 		log("        is not used, or when selected modules are marked with 'keep_hierarchy'\n.");
-		log("        to prevent their dissolution (EXPERIMENTAL).\n");
+		log("        to prevent their dissolution.\n");
 		log("\n");
 		log("    -encfile <file>\n");
 		log("        passed to 'fsm_recode' via 'fsm'\n");