Add checks for compute_slice

[pytorchbot]

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[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15786

• :page_facing_up: Preview Python docs built from this PR

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:x: 2 New Failures, 2 Cancelled Jobs

As of commit 1804e9b32640950aa9764bed190ca3be66283338 with merge base e0dda9059d082537cee36be6c5e4fe3b18c880c0 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh) backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe
• pull / unittest-editable / linux / linux-job (gh) backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe

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

• pull / unittest / macos / macos-job (gh) ##[error]The operation was canceled.
• pull / unittest-editable / macos / macos-job (gh) ##[error]The operation was canceled.

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