Qualcomm AI Engine Direct - Adding QNN backend support for acos core ATen Op

[qti-horodnic]

Summary

Adding support for the acos ATen op by a decomposition pass using the identity:
acos(x) = π/2 - asin(x)

Also fixed a small bug in decompose_log_variants caused by calling get_const_node multiple times in a loop with the same attr_name, creating multiple constant nodes redundantly which point to the same buffer. Added a unit test for that scenario as well.

Test plan

python backends/qualcomm/tests/test_qnn_delegate.py -k TestQNNQuantizedOperator.test_qnn_backend_acos --model SM8750 --host aisw-vm15-labsd --device 545ee4aa --build_folder build-android
python backends/qualcomm/tests/test_qnn_delegate.py -k TestQNNFloatingPointOperator.test_qnn_backend_acos --model SM8750 --host aisw-vm15-labsd --device 545ee4aa --build_folder build-android
python backends/qualcomm/tests/test_qnn_delegate.py -k TestQNNFloatingPointOperator.test_qnn_backend_acos_multi_node --model SM8750 --host aisw-vm19-labsd --device b3bf37fe --build_folder build-android
python backends/qualcomm/tests/test_qnn_delegate.py -k TestQNNQuantizedOperator.test_qnn_backend_acos_multi_node --model SM8750 --host aisw-vm19-labsd --device b3bf37fe --build_folder build-android

For the decompose_log_variants bug fix:

python backends/qualcomm/tests/test_qnn_delegate.py -k TestQNNQuantizedOperator.test_qnn_backend_log1p --model SM8750 --host aisw-vm19-labsd --device 8afa1dd9 --build_folder build-android
python backends/qualcomm/tests/test_qnn_delegate.py -k TestQNNQuantizedOperator.test_qnn_backend_log10 --model SM8750 --host aisw-vm19-labsd --device 8afa1dd9 --build_folder build-android
python backends/qualcomm/tests/test_qnn_delegate.py -k TestQNNQuantizedOperator.test_qnn_backend_log2 --model SM8750 --host aisw-vm19-labsd --device 8afa1dd9 --build_folder build-android

python backends/qualcomm/tests/test_qnn_delegate.py -k TestQNNFloatingPointOperator.test_qnn_backend_log1p --model SM8750 --host aisw-vm19-labsd --device 8afa1dd9 --build_folder build-android
python backends/qualcomm/tests/test_qnn_delegate.py -k TestQNNFloatingPointOperator.test_qnn_backend_log10 --model SM8750 --host aisw-vm19-labsd --device 8afa1dd9 --build_folder build-android
python backends/qualcomm/tests/test_qnn_delegate.py -k TestQNNFloatingPointOperator.test_qnn_backend_log2 --model SM8750 --host aisw-vm19-labsd --device 8afa1dd9 --build_folder build-android

python backends/qualcomm/tests/test_qnn_delegate.py -k TestQNNFloatingPointOperator.test_qnn_backend_log_variants_multi_node --model SM8750 --host aisw-vm19-labsd --device b3bf37fe --build_folder build-android
python backends/qualcomm/tests/test_qnn_delegate.py -k TestQNNQuantizedOperator.test_qnn_backend_log_variants_multi_node --model SM8750 --host aisw-vm19-labsd --device b3bf37fe --build_folder build-android

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18743

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[qti-horodnic]

@pytorchbot label "release notes: qualcomm"

[abhinaykukkadapu]

Thanks for adding the support.