Use same constant in runtime for unset debug handle

[pytorchbot]

This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #12385 by @Gasoonjia
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/gasoonjia/21/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/gasoonjia/21/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/main
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/gasoonjia/21/orig
@diff-train-skip-merge

[pytorch-bot]

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❌ 4 New Failures, 3 Unrelated Failures

As of commit bca5a0e with merge base dd4488d ():

NEW FAILURES - The following jobs have failed:

• Build Presets / linux (pybind, linux.2xlarge, executorch-ubuntu-22.04-clang12) / build (gh)
• Lint / link-check / lint-urls / linux-job (gh)
• pull / unittest-buck / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 9ab9c737c09ccfbcc8e851bd7d34fc9d704954b852ae23da03a57da2d7ad5799 /exec failed with exit code 127

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-openvino-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-quantized-aot-lib-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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