Add checks for compute_slice

[lucylq]

Summary:
Add safety checks to compute_slice, to ensure that we:

1. Do not read outside of the src tensor bounds
2. Do not write outside of the output tensor bounds

Differential Revision: D86433966

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15647

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❌ 2 New Failures, 1 Cancelled Job, 2 Unrelated Failures

As of commit 0cdd555 with merge base 692825d ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / windows / windows-job (gh)
  backends/xnnpack/test/ops/test_conv1d.py::TestConv1d::test_qs8_conv1d_batchnorm_seq
• pull / unittest-editable / windows / windows-job (gh)
  backends/xnnpack/test/ops/test_conv1d.py::TestConv1d::test_qs8_conv1d_batchnorm_seq

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / test-setup-linux-gcc / linux-job (gh)

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

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

• pull / test-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-openvino-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[meta-codesync]

@lucylq has exported this pull request. If you are a Meta employee, you can view the originating Diff in D86433966.

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