Convert block ptr type layouts to `Subgroup2DBlockEncoding` layouts#4463

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alexbaden wants to merge 14 commits intomainfrom

alex/optimize_block_encoding

Commits on Jul 14, 2025

Add pass to convert block load to subgroup 2d block encoding types

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validate scf for loop type changes

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reduce set of module attributes

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fixup typo, cleanup load cast

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break long lines

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remove dead functions

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use attr variable in lit test

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add complex control flow test

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remove unnecessary assert

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further reduce unecessary test values

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properly handle while loops

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propagate layout to tt.advance

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remove unused var

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address review comments
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