generate consistent hashes within interface conversion

test/basic/interface_nested_array.v

@@ -0,0 +1,20 @@
+module top;
+    generate
+        if (1) begin : intf
+            wire x;
+        end
+    endgenerate
+    wire y;
+    genvar i, j, k;
+    generate
+        for (i = 2; i >= 0; i = i - 1) begin
+            initial $display("ModuleA %b %b", intf.x, y);
+            for (j = 2; j >= 0; j = j - 1) begin
+                initial $display("ModuleB %b %b", intf.x, y);
+                for (k = 2; k >= 0; k = k - 1) begin
+                    initial $display("ModuleC %b %b", intf.x, y);
+                end
+            end
+        end
+    endgenerate
+endmodule