Start opt_hier

tests/opt/opt_hier.tcl

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+yosys -import
+
+# per each opt_hier_*.v source file, confirm flattening and hieropt+flattening
+# are combinationally equivalent
+foreach fn [glob opt_hier_*.v] {
+	log -header "Test $fn"
+	log -push
+	design -reset
+
+	read_verilog $fn
+	hierarchy -auto-top
+	prep -top top
+	design -save start
+	flatten
+	design -save gold
+	design -load start
+	opt -hier
+	# check any instances marked `should_get_optimized_out` were
+	# indeed optimized out
+	select -assert-none a:should_get_optimized_out
+	dump
+	flatten
+	design -save gate
+
+	design -reset
+	design -copy-from gold -as gold A:top
+	design -copy-from gate -as gate A:top
+	yosys rename -hide
+	equiv_make gold gate equiv
+	equiv_induct equiv
+	equiv_status -assert equiv
+
+	log -pop
+}