[Executorch][quant] Optimize per channel dequantize

[kimishpatel]

Stack from ghstack (oldest at bottom):

• -> [Executorch][quant] Optimize per channel dequantize #5622
• [Executorch][llama] Add custom_sdpa and use that instead of sdpa_with_kv_cache #5621
• [Executorch] Update EXECUTORCH_LIBRARY macro #5620
• [Executorch][llama] Refactoring sdpa #5619
• [Executorch][llama] Update SDPA op to use quantized kv cache #5618
• Add update_quantized_cache op #5527
• Refactor custom SDPA op to separate kv cache update from the custom sdpa op #5617
• [ExecuTorch] Add quantized kv cache to llama #5616
• Fix dequantize per channel to handle double scale type #5524
• [ExecuTorch] Some updated to kv cache #5615

When using quantized kv cache, dequantization routine takes significantly long.
This diff just vectorizes dequant per channel for common case.

Differential Revision: D63338858

[pytorch-bot]

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❌ 28 New Failures

As of commit bed6c96 with merge base b2517d6 ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-custom-ops-linux (buck2) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-custom-ops-linux (cmake) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-llama-runner-linux (bf16, buck2, portable) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-llama-runner-linux (bf16, cmake, portable) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-llama-runner-linux (fp32, buck2, portable) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-llama-runner-linux (fp32, buck2, xnnpack+custom) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-llama-runner-linux (fp32, buck2, xnnpack+custom+qe) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-llama-runner-linux (fp32, cmake, portable) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-llama-runner-linux (fp32, cmake, xnnpack+custom) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-llama-runner-linux (fp32, cmake, xnnpack+custom+qe) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-llama-runner-linux-android (cmake) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:133:5: error: unknown type name 'int32x4_t'; did you mean 'int32_t'?
• pull / test-llama-runner-qnn-linux (fp32, cmake, qnn) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-llava-runner-linux / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-models-linux (buck2, mv3, portable, linux.2xlarge, 90) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-models-linux (buck2, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-models-linux (cmake, mv3, portable, linux.2xlarge, 90) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-models-linux (cmake, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-models-linux (cmake, vit, portable, linux.2xlarge, 90) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-models-linux (cmake, vit, xnnpack-delegation, linux.2xlarge, 90) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-pybind-build-linux (cmake) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-quantized-aot-lib-linux (cmake) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-selective-build-linux (buck2) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-selective-build-linux (cmake) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / test-setup-linux-gcc (cmake) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: ‘const Tensor’ {aka ‘const class at::Tensor’} has no member named ‘dim_order’
• pull / unittest / linux / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'
• pull / unittest / macos / macos-job (gh)
  /Users/ec2-user/runner/_work/executorch/executorch/pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:133:5: error: unknown type name 'int32x4_t'; did you mean 'int32_t'?
• pull / unittest-arm (buck2) / linux-job (gh)
  /pytorch/executorch/kernels/quantized/cpu/op_dequantize.cpp:172:14: error: no member named 'dim_order' in 'at::Tensor'

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This pull request was exported from Phabricator. Differential Revision: D63338858