Change TORCH_LIBRARY to TORCH_LIBRARY_FRAGMENT

[metascroy]

This is to prevent conflicts between CPU/MPS because torch requires all ops be defined in same block.

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/1645

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❌ 1 New Failure, 1 Unrelated Failure

As of commit c08425b with merge base 7815262 ():

NEW FAILURE - The following job has failed:

• PR Label Check / Check PR Labels (gh)
  Process completed with exit code 1.

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Code Analysis with Ruff / build (3.9) (gh) (trunk failure)
  torchao/experimental/tests/test_packed_linear_int8_dynamic_activation_intx_weight_layout_target_aten.py:20:5: F401 [*] torchao.quantization.granularity.PerGroup imported but unused

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[metascroy]

@manuelcandales how do I test the change? Is there a script I should run?