[Inductor][Tests] Update get_divisible_by_16 function in test_torchinductor.py to work correctly with new Triton (pytorch#147865)

Pull Request resolved: pytorch#147865
Approved by: https://github.com/davidberard98

Author: anmyachev

test/inductor/test_torchinductor.py

@@ -269,7 +269,15 @@ def get_divisible_by_16(cfg):
     # attribute was renamed between triton versions, from "divisible_by_16" to "divisibility_16"
     if hasattr(cfg, "divisibility_16"):
         return cfg.divisibility_16
-    return cfg.divisible_by_16
+    elif hasattr(cfg, "divisible_by_16"):
+        return cfg.divisible_by_16
+    # `cfg` example:
+    # {(0,): [['tt.divisibility', 16]], (1,): [['tt.divisibility', 16]], (3,): [['tt.divisibility', 16]]}
+    return [
+        key[0]
+        for key, value in cfg.items()
+        if len(key) == 1 and value[0] == ["tt.divisibility", 16]
+    ]
 
 
 class TestCase(InductorTestCase):