Fix for pr2909414.

Currently the compiler only applies defparam statements that are
found in the initial root module hierarchy. This patch ensures that
defparam statements within scopes created by generate constructs or
instance arrays are also applied.

elaborate.cc

@@ -4405,14 +4405,17 @@ Design* elaborate(list<perm_string>roots)
 	    des->elaboration_work_list.push_back(es);
       }
 
-	// After the work items for the root scope elaboration, push a
-	// work item to process the defparams.
-      des->elaboration_work_list.push_back(new top_defparams(des));
-
 	// Run the work list of scope elaborations until the list is
 	// empty. This list is initially populated above where the
 	// initial root scopes are primed.
       while (! des->elaboration_work_list.empty()) {
+	      // Push a work item to process the defparams of any scopes
+	      // that are elaborated during this pass. For the first pass
+	      // this will be all the root scopes. For subsequent passes
+	      // it will be any scopes created during the previous pass
+	      // by a generate construct or instance array.
+	    des->elaboration_work_list.push_back(new top_defparams(des));
+
 	      // Transfer the queue to a temporary queue.
 	    list<elaborator_work_item_t*> cur_queue;
 	    while (! des->elaboration_work_list.empty()) {