[TEST] Majority of `test_bitwise_op` cases don't generate any artifacts

[minjang]

python3 -m pytest -n 10 "python/test/unit/language/test_core.py" -k "test_bitwise_op[" --device cuda

1587 items are all passed.

But when I look at the triton cache directory, only 576 ptx files were generated. Around ~60% testing cases didn't generate any artifacts.

Not a serious issue. Just reporting it.