Use PTEFile class in serialize_pte_binary

[lucylq]

Stack from ghstack (oldest at bottom):

• Do not restore constant_buffer, and use bytes instead of Buffer #15802
• -> Use PTEFile class in serialize_pte_binary #15801
• Introduce PTEFile class #15800

Take in a PTE file for serialization instead of program, mutable_segments, named_data segments separately.

Differential Revision: D86908241

[pytorch-bot]

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❌ 11 New Failures, 5 Unrelated Failures

As of commit 3253a87 with merge base 7600df8 ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for exir/_serialize/_program.py:
• Lint / lintrunner-mypy / linux-job (gh)
  >>> Lint for backends/arm/test/misc/test_call_operator_submodule.py:
• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Could not load libtorchcodec. Likely causes:
• Test CUDA Builds / test-model-cuda-e2e (google, gemma-3-4b-it, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t a72eea05eec64351613a6f8ea95a769b7039aaf8d85c13df23ae47704e064f0e /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (google, gemma-3-4b-it, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t 0a2d2a4086c36919fb8a873edcfb951b35844ae419bb4637733d6ddefd3859e9 /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t cffe1774903d40ef134dd324a2dc45940e3eaddf432f16a11a8fc22839bf0e78 /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t 5323ac0d97a95a71c1a432fac9145eefbe7699f903e26d0f6a2942f6565ea797 /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, quantized-int4-weight-only) / linux-job (gh)
  RuntimeError: Command docker exec -t 6066ff4f8fabd20fd2ebf0f6e26d9c53278d53fedd603b54ead1459f542bd903 /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t 0dfdfa7251cc6a4214ac2a309bbed3e427d0424bac06c79c81cc8df1ad75de37 /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t f15cca589e38df756846d743849151ea82f408019f6b6a2879fc8fe0d08cdacf /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, quantized-int4-weight-only) / linux-job (gh)
  RuntimeError: Command docker exec -t ce76131d5fb3ec989141630579a878a8f4c1431c5ce111e2983b0e7fdc59282a /exec failed with exit code 1

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

• Test Metal Backend / test-model-metal-e2e (mistralai, Voxtral-Mini-3B-2507, non-quantized) / macos-job (gh) (matched macos rule in flaky-rules.json)
  File doesn't exist

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 / linux / linux-job (gh) (trunk failure)
  backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe
• pull / unittest / macos / macos-job (gh) (trunk failure)
  backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe

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[larryliu0820]

why _PTEFile but not PTEFile

[larryliu0820]

Is PTEFile supposed to be private only?