[wwwind]

PyTorch 2.15 adds a _guards_fn call_module node to ExportedProgram.module() by default. This causes Arm's PT2E quantization passes to fail with
ExportPassBaseError: call_module is not supported.

Changes:

Remove unused _guards_fn nodes before Arm quantization annotation.

Preserve unrelated call_module nodes and reject unsafe guard removal.

Add regression tests for guarded and unguarded exports.

This allows prepare_pt2e(ep.module(), quantizer) to work
without requiring check_guards=False in user code.

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

[pytorch-bot]

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❌ 1 New Failure, 1 Unrelated Failure

As of commit 538f541 with merge base 5af315a ():

NEW FAILURE - The following job has failed:

• trunk / test-samsung-models-linux / linux-job (gh)
  test_inception_v4_fp16

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

• Test RISC-V Backend / test-riscv (mv2, true, true) / run / linux-job (gh) (matched linux rule in flaky-rules.json)
  E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/noble-security/restricted/binary-amd64/Packages.gz File has unexpected size (2136763 != 2140964). Mirror sync in progress? [IP: 2620:2d:4002:1::102 80]

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