Merge pull request #1490 from YosysHQ/clifford/autoname

Add "autoname" pass and use it in "synth_ice40"

techlibs/ice40/synth_ice40.cc

@@ -380,6 +380,7 @@ struct SynthIce40Pass : public ScriptPass
 
 		if (check_label("check"))
 		{
+			run("autoname");
 			run("hierarchy -check");
 			run("stat");
 			run("check -noinit");