fix declaration order of nested package items

test/basic/nest_order.sv

@@ -0,0 +1,11 @@
+localparam Z = 1;
+localparam Y = 5'(Z);
+localparam X = 5'(Y);
+
+module top;
+    initial begin
+        $display("%b", X);
+        $display("%b", Y);
+        $display("%b", Z);
+    end
+endmodule

test/basic/nest_order.v

@@ -0,0 +1,7 @@
+module top;
+    initial begin
+        $display("%b", 5'b1);
+        $display("%b", 5'b1);
+        $display("%b", 32'b1);
+    end
+endmodule