[ET-VK] Implementation of to_dim_order_copy

[SS-JIA]

Stack from ghstack (oldest at bottom):

• [ET-VK] buffer implementation of rotary positional embeddings #15620
• [ET-VK][ez] Ensure that attn_weight buffers do not exceed GPU buffer numel limit #15651
• -> [ET-VK] Implementation of to_dim_order_copy #15619

Title says it all!

Previously, to_dim_order_copy was handled by removing the op. However, this is not possible if the op is modifying the dtype of the original tensor, so these instances of the op would be skipped by the partitioner.

This diff adds an implementation dtype conversion, which allows to_dim_order_copy to be lowered.

Differential Revision: D86340341

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15619

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 2 New Failures, 2 Cancelled Jobs, 4 Unrelated Failures

As of commit e70dd50 with merge base d361573 ():

NEW FAILURES - The following jobs have failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 255
• pull / unittest / linux / linux-job (gh)
  examples/models/test/test_export.py::ExportTest::test_mv3_export_to_executorch

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / test-binary-size-linux-gcc / linux-job (gh)
• pull / test-openvino-linux / linux-job (gh)

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Test Metal Backend / test-voxtral-metal-e2e / macos-job (gh) (matched macos rule in flaky-rules.json)
  File doesn't exist

BROKEN TRUNK - The following jobs failed but was present on the merge base:

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

• pull / test-setup-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / windows / windows-job (gh) (trunk failure)
  backends/xnnpack/test/ops/test_conv1d.py::TestConv1d::test_qs8_conv1d_batchnorm_seq
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  backends/xnnpack/test/ops/test_conv1d.py::TestConv1d::test_qs8_conv1d_batchnorm_seq

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[github-actions]

This PR needs a release notes: label

If your change should be included in the release notes (i.e. would users of this library care about this change?), please use a label starting with release notes:. This helps us keep track and include your important work in the next release notes.

To add a label, you can comment to pytorchbot, for example
@pytorchbot label "release notes: none"

For more information, see
https://github.com/pytorch/pytorch/wiki/PyTorch-AutoLabel-Bot#why-categorize-for-release-notes-and-how-does-it-work.