generate consistent hashes within interface conversion

test/basic/interface_nested_array.sv

@@ -0,0 +1,23 @@
+interface Interface;
+    logic x;
+endinterface
+
+module ModuleC(Interface intf, input y);
+    initial $display("ModuleC %b %b", intf.x, y);
+endmodule
+
+module ModuleB(Interface intf, input y);
+    initial $display("ModuleB %b %b", intf.x, y);
+    ModuleC m[2:0] (intf, y);
+endmodule
+
+module ModuleA(Interface intf, input y);
+    initial $display("ModuleA %b %b", intf.x, y);
+    ModuleB m[2:0] (intf, y);
+endmodule
+
+module top;
+    logic y;
+    Interface intf();
+    ModuleA m[2:0] (intf, y);
+endmodule