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This reverts commit 9bb9d22645cf5d137a763fe439bae9f4e2b57457.

* code drop
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* Add FP8 scale support and fix alignment for grouped GEMM

- Add FP8 scale_inv pointer handling in nvte_grouped_gemm for proper FP8 GEMM
- Fix random padding in tests to ensure 16-byte alignment for all dtypes
- Reorder GroupedGemmSetupWorkspace members for natural alignment
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* fix
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* Grouped GEMM: code cleanup and NULL C support

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- Simplify select_grouped_operand by removing dead code branches
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- Extract set_fp8_scale_pointers and init_matrix_layouts helpers
- Add safety check for FP8 on Hopper column-wise fallback
- Support NULL C tensor when beta=0 (uses D as placeholder)
- Remove unused get_scale_inv() from test
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* Grouped GEMM: per-matrix alpha/beta support

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* Fix alpha/beta numel - use SimpleTensor::numel()
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