Use native APIs in LLaMA demo app.

[shoumikhin]

Summary: .

Differential Revision: D82040673

[pytorch-bot]

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❌ 7 Cancelled Jobs, 8 Unrelated Failures

As of commit fa79d20 with merge base dbac09c ():

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• periodic / test-models-linux (buck2, mv3, portable, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (buck2, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (cmake, mv3, portable, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (cmake, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (cmake, vit, portable, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (cmake, vit, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh)
• pull / test-openvino-linux / linux-job (gh)
  ##[error]The operation was canceled.

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Build Presets / windows (pybind) / build (gh) (trunk failure)
• pull / test-models-linux (emformer_transcribe, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh) (trunk failure)
• pull / test-models-linux (linear, portable, linux.2xlarge) / linux-job (gh) (trunk failure)
• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh) (trunk failure)
• pull / test-models-linux (mobilebert, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh) (trunk failure)
• pull / test-models-linux (resnet50, portable, linux.2xlarge) / linux-job (gh) (trunk failure)
• pull / test-vulkan-models-linux / linux-job (gh) (trunk failure)
• pull / test-vulkan-operators-linux / linux-job (gh) (trunk failure)

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