Skip ATen-mode out-of-range integer clamp/hardtanh death tests

[malfet]

pytorch/pytorch#193169 changes how ATen's scalar clamp handles an out-of-range
integer bound. Instead of converting the bound straight to the input dtype
(which raised for signed dtypes and silently wrapped for unsigned ones), ATen
now reconciles the bound by direction: a min below the dtype's range (or a
max above it) is a no-op and is dropped, while the opposite direction is
rejected. hardtanh shares this behavior.

The portable kernels keep their own strict bounds check and are unaffected, but
the ATen-mode death tests (built with -DUSE_ATEN_LIB) assume every out-of-range
integer bound raises, which no longer holds. Skip those integer cases in ATen
mode, matching the existing skips for negative uint8 and out-of-range int32
bounds:

• op_clamp_test: ByteTensorTooLargeClampDies
• op_hardtanh_test: ByteTensorTooLargeScalarDies, CharTensorTooSmallScalarDies,
  ShortTensorTooLargeScalarDies (gated in the fixture helper, not the shared
  ScalarOverflowTestMacros.h, which eight suites depend on)

Co-Authored-By: Claude Opus 4.8 noreply@anthropic.com

Summary

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[pytorch-bot]

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[Copilot]

Pull request overview

This PR updates ExecuTorch kernel death tests to account for upstream ATen behavior changes around out-of-range integer bounds for clamp/hardtanh when building/running in ATen mode (-DUSE_ATEN_LIB). Since ATen now treats some out-of-range integer bounds as a direction-dependent no-op (instead of always erroring), these specific death tests no longer reliably hold under ATen kernels and are now skipped there.

Changes:

• Skip OpClampOutTest.ByteTensorTooLargeClampDies when SupportedFeatures::get()->is_aten is true.
• Skip the integral dtype scalar-overflow hardtanh death tests in ATen mode by gating them in OpHardTanhTest::expect_bad_scalar_value_dies.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
kernels/test/op_hardtanh_test.cpp	Adds ATen-mode skip for integral hardtanh scalar overflow death tests via the shared fixture helper.
kernels/test/op_clamp_test.cpp	Adds ATen-mode skip for the “too large uint8 bound” clamp death test that no longer universally errors in ATen.

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