[CK_Tile] Refactor amdgcn_mma policy structs#5272

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krithalith wants to merge 9 commits intodevelopfrom

users/krithalith/ck/unification_policy_struct_refactor

Commits on Mar 18, 2026

Replace layout params with cleaner ones in amdgcn structs, derive register vector sizes.
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Reduce policy struct code duplication with amdgcn_mma_base class
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Remove already overloaded "block" term for intrinsic sizes and replace with "frag". In places where "frag" was already used, replace that with "chunk".
krithalith
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Simplify MmaOpTraits now that almost everything is directly available from MmaOp.
krithalith
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Address PR comments except for those about layout explanations. Also missed a number of Block / Frag / Chunk refactor spots.
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Add detailed layout parameter descriptions.
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Address review comments (comment changes only)
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Address review comments: tweak comments + change Chunk to WaveTile + reduce dummy exec print verbosity.
krithalith
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Change some remaining references to Chunk to WaveTile
krithalith
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