Arm backend: Make composable_quantizer default

[AdrianLundell]

A few fixes needed:

• Add new ops added since initial upstream of composable_quantizer
• Add while-op quantize fix from 3be4546 to TosaQuantizerV2
• Add fixed_qparams fix from fb90480 to TosaQuantizerV2
• Update some tests to mirror new behaviours
• Update quanitzer_tutorial to not be WIP
• Remove hardswish from FUSED_ACTIVATION_OPS
• Explicitly check that weights and biases are input args to conv/ linear ops. The assumption that wights and biases are the only parameters of networks does not hold for real models.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

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❌ 6 New Failures, 4 Unrelated Failures

As of commit 4595733 with merge base b73df0b ():

NEW FAILURES - The following jobs have failed:

• pull / test-coreml-bc-macos (macos-m2-stable) / macos-job (gh)
  The process '/usr/bin/git' failed with exit code 128
• pull / test-mcu-cortex-m-backend / linux-job (gh)
  RuntimeError: Command docker exec -t 31dd03d541cc51f316790fec237f281dcbb3c26f6824eac004ee7829128ffe99 /exec failed with exit code 1
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 353ad134ab57d13f7bf6e8fd79633f115f09c04e66b10ab548160a8a49ba0d2b /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t e551bbe260b88903fa519308c35cd889222eefe52ff6d194a5b43d7d29ee5cfa /exec failed with exit code 1
• trunk / test-models-macos-cpu (llama3_2_vision_encoder, portable) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / unittest-release / linux / linux-job (gh)
  RuntimeError: Command docker exec -t abccc80d01e26346ea45562914b5e18c3638bd1f6115d1a2b80e7a929e7dc1b1 /exec failed with exit code 1

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

• Test ARM Backend / test-arm / test-backend-linux (arm_vgf_fp, operators) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128

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

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

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

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[Copilot]

Pull request overview

This PR switches the Arm backend’s TOSAQuantizer to use the composable quantizer implementation by default, and updates Arm quantization annotation/support logic plus tests/tutorial materials to match the new behaviors (including while-loop and fixed-qparams handling).

Changes:

• Make TOSAQuantizer default to use_composable_quantizer=True.
• Extend/update quantizer support + annotation behavior (e.g., while-loop shared-qspec handling, fixed-qparams input qspecs for trig ops, additional supported ops).
• Update Arm backend tests and the Arm quantizer tutorial notebook to reflect the new defaults/behaviors.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
examples/arm/quantizer_tutorial.ipynb	Removes WIP framing in the composable quantizer tutorial intro.
backends/arm/test/ops/test_while.py	Adds an INT while-loop test path forcing composable quantizer usage.
backends/arm/test/ops/test_transpose_conv2d.py	Updates tests to use TOSAQuantizationConfig for global config setup.
backends/arm/test/ops/test_to_copy.py	Simplifies redundant-cast xfail configuration shared between FP/INT.
backends/arm/test/misc/test_shared_qspecs.py	Updates golden expectations for shared-qspec annotation counts/qparams.
backends/arm/test/misc/test_quant_custom_meta.py	Adjusts test quantizer config (including set_io(None)) to match new behavior.
backends/arm/quantizer/quantizer_support.py	Updates supported/fused patterns (and adds more supported ops).
backends/arm/quantizer/quantization_config.py	Adds fixed-qparams input spec generation for specific trig ops under composable flow.
backends/arm/quantizer/arm_quantizer.py	Makes composable quantizer the default for TOSAQuantizer.
backends/arm/quantizer/arm_quantizer_utils.py	Tightens weight/bias identification and adds while-loop shared-qspec special-casing; extends shared-qspec op list.

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