[CI] Add entrypoint to hc_combine test for standalone execution (#37406)

test/registered/kernels/ops/layernorm/test_hc_combine.py

@@ -1,3 +1,5 @@
+import sys
+
 import pytest
 import torch
 
@@ -51,3 +53,7 @@ def test_hc_combine_strided_pre():
     ref = _reference(x_flat, pre, hc, torch.bfloat16)
     scale = ref.float().abs().max().clamp(min=1e-6)
     assert (got.float() - ref.float()).abs().max() / scale < 5e-2
+
+
+if __name__ == "__main__":
+    sys.exit(pytest.main([__file__]))