[MPS] Remove remaining casts from 13.3 (#95870)

Pull Request resolved: https://github.com/pytorch/pytorch/pull/95870
Approved by: https://github.com/kulinseth

test/test_mps.py

diff --git a/test/test_mps.py b/test/test_mps.py
index 0c77fa5..9877612 100644
--- a/test/test_mps.py
+++ b/test/test_mps.py
@@ -3852,6 +3852,15 @@
         helper(2, 8, 4, 4, "min", torch.float16)
         helper(2, 8, 4, 4, "min", torch.int64)
 
+    @unittest.skipIf(product_version < 13.3, "Long data type supported from macOS 13.3 and above")
+    def test_reduction_sum_max_long_val(self):
+        x_mps = torch.tensor([sys.maxsize, sys.maxsize - 10, sys.maxsize - 5, sys.maxsize - 18], device="mps")
+        x_cpu = x_mps.detach().clone().cpu()
+
+        res_mps = torch.sum(x_mps)
+        res_cpu = torch.sum(x_cpu)
+        self.assertEqual(res_mps, res_cpu)
+
     # Test forward max
     # Note - don't test grad now
     def test_max_el(self):