[TESTING] Enable execution of test_packed_8x8x32_resnet50 (apache#13799)

* [TESTING] Enable execution of test_packed_8x8x32_resnet50
Resnet 50 is passing now. Need to add below mentioned changes as well for test to pass.

- Add condition for IndexMap
- Add empty dict while calling tune_conv2d_template to avoid failure

* Fix unused variable error

* Remove unused variable and change check in if condition

src/meta_schedule/database/database_utils.cc

@@ -77,6 +77,8 @@ void JSONDumps(ObjectRef json_obj, std::ostringstream& os) {
       JSONDumps(kv.second, os);
     }
     os << "}";
+  } else if (json_obj->IsInstance<tir::IndexMapNode>()) {
+    // Do nothing for index maps to start
   } else {
     LOG(FATAL) << "TypeError: Unsupported type in JSON object: " << json_obj->GetTypeKey();
   }

tests/python/contrib/test_hexagon/metaschedule_e2e/test_resnet50_int8.py

@@ -410,7 +410,7 @@ def test_packed_8x8x32_resnet50(hexagon_launcher):
 
     if do_tune:
         hexagon_lowered = tune_conv2d_template(
-            mod, _schedule_packed_8x8x32_conv2d, "packed_8x8x32", params, hexagon_launcher
+            mod, _schedule_packed_8x8x32_conv2d, "packed_8x8x32", params, hexagon_launcher, {}
         )
     else:
         with tvm.transform.PassContext(opt_level=3):