Arm backend: Add INT64 support to to_copy

[oscarandersson8218]

Partition to_copy from INT64 as these will be computed AOT and cast to INT32. Also disables partitioning of int-to-int casts for FP-profile.

cc @digantdesai @freddan80 @per @zingo

[pytorch-bot]

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❌ 2 New Failures

As of commit 8de968a with merge base cfd9b68 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t e6a1b55294f7283af6aa6187b0f0a6b9c3e765288580752d6210de7bf73ef7bd /exec failed with exit code 1
• trunk / test-models-linux-aarch64 (qwen2_5, portable, linux.arm64.2xlarge) / linux-job (gh)
  RuntimeError: Command docker exec -t 7ca4330d7404f03278abd17d20ef71b1f631cc9be1dc7d70b55809aac2ca4b31 /exec failed with exit code 1

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