opt_mem, memory_*: Refuse to operate in presence of processes

Processes can contain `MemWriteAction` entries which are invisible to
most passes operating on memories but which will be lowered to write
ports later on by `proc_memwr`. For that reason we can get corrupted
RTLIL if we sequence the memory passes before `proc`. Address that by
making the affected memory passes ignore modules with processes.

passes/opt/opt_mem.cc

@@ -52,6 +52,9 @@ struct OptMemPass : public Pass {
 
 		int total_count = 0;
 		for (auto module : design->selected_modules()) {
+			if (module->has_processes_warn())
+				continue;
+
 			SigMap sigmap(module);
 			FfInitVals initvals(&sigmap, module);
 			for (auto &mem : Mem::get_selected_memories(module)) {