Add bitwise left/right

[mergennachin]

Fixes #15673 (comment)

Did not add as core aten op. But used "func" and enabled exporting via:

to_edge_transform_and_lower(
        exported_program,
        partitioner=None,
        compile_config=EdgeCompileConfig(
            _core_aten_ops_exception_list=[
                torch.ops.aten.bitwise_left_shift.Tensor,
                torch.ops.aten.bitwise_left_shift.Tensor_Scalar,
                torch.ops.aten.bitwise_right_shift.Tensor,
                torch.ops.aten.bitwise_right_shift.Tensor_Scalar,
            ]
        ),
    )

In the future, we may promote to core aten op.

[mergennachin]

#15673 (comment)

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Pull Request Overview

This PR adds support for bitwise left shift (<<) and right shift (>>) operations to the ExecutorTorch portable kernel library, following the existing pattern for bitwise operations (and, or, xor).

Key Changes:

• Implementation of bitwise_left_shift and bitwise_right_shift operators with both Tensor and Scalar variants
• Comprehensive test coverage for both operations including edge cases (zero shift, different data types)
• Build system integration across Buck (bzl), CMake, and YAML configuration files

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
shim_et/xplat/executorch/kernels/portable/op_registration_util.bzl	Adds Buck build targets for the new shift operators (ordering needs correction)
kernels/test/targets.bzl	Registers test targets for both shift operations (correctly ordered)
kernels/test/CMakeLists.txt	Adds test source files to CMake build (correctly ordered)
kernels/portable/functions.yaml	Defines kernel function signatures (should use - op: instead of - func:)
kernels/portable/cpu/pattern/bitwise_op.h	Adds shift operation functors and templates (contains redundant code)
kernels/portable/cpu/op_bitwise_left_shift.cpp	Implements left shift operation using the bitwise pattern
kernels/portable/cpu/op_bitwise_right_shift.cpp	Implements right shift operation using the bitwise pattern
kernels/test/op_bitwise_left_shift_test.cpp	Provides comprehensive test coverage for left shift
kernels/test/op_bitwise_right_shift_test.cpp	Provides comprehensive test coverage for right shift

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[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15893

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⏳ 28 Pending, 2 Unrelated Failures

As of commit c1ad491 with merge base 62dccf1 ():

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

• Test CUDA Builds / check-all-cuda-builds (gh) (detected as infra flaky with no log or failing log classifier)
• Test CUDA Builds / test-executorch-cuda-build-12.9 / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated no new comments.

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