Remove asserts in CoreML resize

[metascroy]

Summary:
The assert(shape[i] <= shape_[i]) constraint in MultiArray::MemoryLayout::resize() was unnecessary and overly restrictive.

MemoryLayout is purely metadata describing shape and strides - it has no knowledge of the underlying memory allocation. The actual memory safety is guaranteed at a higher level: ExecuTorch tensors are pre-allocated with sufficient capacity to handle dynamic output shapes from CoreML model execution.

The resize function is called in ETCoreMLModelManager.mm to update output tensor metadata after model inference, where the new shape comes directly from CoreML's modelOutputs[i].shape. Since the ExecuTorch output buffers are sized appropriately for the model's maximum output dimensions, the resize operation is always safe regardless of whether the new shape is smaller or larger than the previous metadata indicated.

The remaining asserts are retained because they catch actual programming errors:

• assert(shape.size() == shape_.size()) - prevents rank mismatch causing out-of-bounds access
• assert(shape[i] >= 1) - ensures valid dimensions for correct stride computation

Reviewed By: GregoryComer

Differential Revision: D93942192

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17626

• 📄 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, 1 Unrelated Failure

As of commit 404f1d5 with merge base 4dadf24 ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 052f9ba9fac24b29f8f0c644947cc428e55a093a6cb539c891591ee825cbd74e /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 5852beb90cac6e55013efebe8914f2465be1e5cbbef24717595b248586a85bd2 /exec failed with exit code 1

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

• Test CUDA Builds / unittest-cuda / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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

[meta-codesync]

@metascroy has exported this pull request. If you are a Meta employee, you can view the originating Diff in D93942192.

[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.