Allow graceful handling of cpuinfo init failure

[GregoryComer]

Summary: Don't fatally assert when cpuinfo_initialize fails. This can happen in rare cases on weird hardware. This change instead logs an error and allows execution to continue without the threadpool.

Differential Revision: D74604740

Test Plan:
I locally modified cpuinfo_initialize to always return false. I then attempted to run a model (dl3_xnnpack_fp32.pte) with executor_runner_optimized. With this change, it outputs the following:

E 00:00:00.001021 executorch:XNNPACKBackend.cpp:49] Failed to initialize, XNNPACK status: 0x5
I 00:00:00.087180 executorch:executor_runner_lib.cpp:410] Model file /home/gjcomer/dl3_xnnpack_fp32.pte is loaded.
I 00:00:00.087213 executorch:executor_runner_lib.cpp:420] Running method forward
I 00:00:00.087231 executorch:executor_runner_lib.cpp:470] Setting up planned buffer 0, size 61424384.
E 00:00:00.110105 executorch:method.cpp:78] Backend XnnpackBackend is not available.
F 00:00:00.110144 executorch:executor_runner_lib.cpp:517] In function executor_runner_benchmark(), assert failed (method.ok()): load_me

[pytorch-bot]

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❗ 1 Active SEVs

There are 1 currently active SEVs. If your PR is affected, please view them below:

• [PREEMPTIVE] Removal of ephemeral variants on scale-config.yml

❌ 2 New Failures, 3 Pending

As of commit 3a86502 with merge base 518324f ():

NEW FAILURES - The following jobs have failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 255
• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh)
  RuntimeError: Command docker exec -t cd24f7c8d59fb2a6a46c3f38e096a2c12622b45ab7da091f246c973b3d11e9d6 /exec failed with exit code 1

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D74604740

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D74604740