Arm backend: Don't execute eagerly with sym-ints

[oscarandersson8218]

Passes that eagerly executes ops with symbolic shapes to trace new metadata will break the graph.

pytorch/pytorch#182940 tries to figure out why eager execution breaks the graph.

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

[pytorch-bot]

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❌ 3 New Failures

As of commit a6d99fc with merge base a142873 ():

NEW FAILURES - The following jobs have failed:

• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh)
  RuntimeError: Command docker exec -t af71fa2a694e43713247960ea6e7ba4e5077bd3f7e0de0e29bad323771150534 /exec failed with exit code 139
• trunk / test-models-macos-cpu (mv3, xnnpack-quantization-delegation) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / unittest-release / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_fp16_conv2d

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