NXP backend: Add prelu support using new neutron flow

[roman-janik-nxp]

Summary

Add tests verifying correct support for prelu by the Neutron backend using the new Neutron MLIR flow

Test plan

Unit tests provided.

cc @robert-kalmar @JakeStevens @digantdesai @rascani

[pytorch-bot]

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❌ 4 New Failures, 4 Unrelated Failures

As of commit e8e3457 with merge base f5acbdb ():

NEW FAILURES - The following jobs have failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 1
• pull / test-arm-backend-no-driver (test_pytest_ops_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t d33f7ffca5ffba4cbf2e0ca3dd785bb214c933c1a96c9e5d9e729772070f6818 /exec failed with exit code 1
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t e0b42684b7d9fbd20a8cf212f711272f84faf02d8284b8b0ddc251723105a6d1 /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t a214d7e69de3ab7f5b3bf182a375042512c31912ac5ac58597a84107c900e7b9 /exec failed with exit code 1

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

• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh) (trunk failure)
• pull / unittest / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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[roman-janik-nxp]

@novak-vaclav

[Copilot]

Pull request overview

Adds/expands PReLU delegation coverage for the NXP Neutron backend “new MLIR flow” by updating target-support checks (notably broadcast handling) and adding/refreshing unit tests and helper aliases/models.

Changes:

• Introduces a new broadcast eligibility helper (inputs_satisfy_broadcast_condition) and switches Add/Mul/Sub/PReLU converters to use it.
• Updates Neutron PReLU converter support rules and adds new test coverage (more ranks, conv+prelu, and num_parameters variant), including new op aliases/models.
• Extends Add/Mul/Sub converter broadcast test parametrizations with an additional case.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
backends/nxp/tests/ops_aliases.py	Adds new op aliases used by updated tests (e.g., Prelu, GtScalar, WhereSelf).
backends/nxp/tests/models.py	Adds ConvPReLUModule test model to cover conv+prelu delegation.
backends/nxp/tests/ir/converter/node_converter/test_sub_tensor_converter.py	Adds an extra broadcast test case.
backends/nxp/tests/ir/converter/node_converter/test_prelu_converter.py	Reworks PReLU tests to the newer lower_run_compare harness and expands shape coverage.
backends/nxp/tests/ir/converter/node_converter/test_mul_tensor_converter.py	Adds an extra broadcast test case.
backends/nxp/tests/ir/converter/node_converter/test_add_tensor_converter.py	Adds an extra broadcast test case.
backends/nxp/backend/ir/converter/node_converters/ops_converters/sub_tensor_converter.py	Uses the new broadcast eligibility helper.
backends/nxp/backend/ir/converter/node_converters/ops_converters/prelu_converter.py	Updates target-support checks for PReLU in the new flow.
backends/nxp/backend/ir/converter/node_converters/ops_converters/mul_tensor_converter.py	Uses the new broadcast eligibility helper.
backends/nxp/backend/ir/converter/node_converters/ops_converters/add_tensor_converter.py	Uses the new broadcast eligibility helper.
backends/nxp/backend/ir/converter/node_converter.py	Adds inputs_satisfy_broadcast_condition (element-count based).

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