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[Ascend] Support native NZ output for L0C-to-UB copies - #5

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Denverjin wants to merge 3 commits into
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codex/ascend-l0c-ub-nz
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Denverjin wants to merge 3 commits into
mainfrom
codex/ascend-l0c-ub-nz

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@Denverjin

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L0C-to-UB copies currently force NZ-to-ND conversion. Honor an explicitly annotated L0C-compatible NZ layout on the UB destination, preserve the physical panel pitch for partial copies, and avoid ND-specific tail padding. Dense destinations continue to use the existing ND path.

This isolates the native NZ-output compiler support from the FlashMLA example and from the partial UB-to-L1 NZ-copy work in tile-ai#3530.

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