Buck fwd-fix: wire up legalize_portable_dim_order_pass (#20971)

[psiddh]

Summary:

Forward fix for D111976876 (DiffTrain import of pytorch/executorch #20878). That diff added executorch/exir/passes/legalize_portable_dim_order_pass.py and imports LegalizePortableDimOrderPass at the top of exir/passes/__init__.py, but like every DiffTrain import it carried no Buck changes. Since exir/passes/BUCK uses explicit per-file srcs lists (no globs), the new module was never wired into any target, so importing executorch.exir.passes fails with ModuleNotFoundError: No module named 'executorch.exir.passes.legalize_portable_dim_order_pass'. This breaks every fbcode consumer of //executorch/exir/passes:lib, including the arm test listing for fold_scalar_mul_into_conv_pass (D112075757) and the residual backends/arm/test:* listing failures on D112027047.

This adds a legalize_portable_dim_order_pass runtime.python_library (deps mirror the sibling memory_format_ops_pass) and adds it to the :lib target deps, in both fbcode and xplat exir/passes/BUCK.

Authored with Claude Code.

Differential Revision: D112243998

[pytorch-bot]

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[Copilot]

Pull request overview

This PR fixes Buck build wiring for LegalizePortableDimOrderPass by adding a dedicated runtime.python_library target for legalize_portable_dim_order_pass.py and ensuring it is pulled into executorch.exir.passes via the existing :lib target dependencies. This prevents ModuleNotFoundError when consumers import executorch.exir.passes under Buck.

Changes:

• Add a new legalize_portable_dim_order_pass runtime.python_library target with the required deps.
• Add :legalize_portable_dim_order_pass to the :lib target deps so the module is available when __init__.py imports it.

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