Arm backend: Update for missing operators for int16x8

[SaoirseARM]

Summary

Updates to operators for int16:

• avg_pool2d, clamp, constant_pad_nd, eq, ge, gt, le, lt, max_pool2d, upsample_bilinear, upsample_nearest2d

Test plan

Unit tests added for affected operators

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15521

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❌ 1 New Failure, 6 Unrelated Failures

As of commit 70e5200 with merge base 964515c ():

NEW FAILURE - The following job has failed:

• Build Presets / apple (ios-simulator) / build (gh)
  Library not loaded: @rpath/liblz4.1.dylib

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

• pull / test-setup-linux-gcc / linux-job (gh) (similar failure)
  ##[error]The operation was canceled.

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-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.
• 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
• trunk / unittest-release / windows / windows-job (gh) (trunk failure)
  backends/xnnpack/test/ops/test_conv1d.py::TestConv1d::test_qs8_conv1d_batchnorm_seq

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[SaoirseARM]

@pytorchbot label ciflow/trunk

[SaoirseARM]

@pytorchbot label "release notes: none"

[SaoirseARM]

@pytorchbot label 'partner: arm'

[zingo]

@SS-JIA thanks for the help with all the larger patches, here is another one for you, that I also think should be buck2 fine but better to doublecheck :)

[zingo]

@SaoirseARM has an arm fail and needs a rebase, lets see if the rebase fixes the fails :)

[Ninja91]

Thanks for adding these set of ops with 16a8w for U55/U85

[SS-JIA]

Sorry just seeing this one, will try to import this internally since it is a bigger change!

[Ninja91]

LGTM

[SS-JIA]

Should be okay

[zingo]

Testa are unrelated