[X86] Fold nested VGF2P8AFFINEQB instructions (#195210) Given that `vgf2p8affineqb` can perform arbitrary XOR permutations of the input, all nested affine transformations can be performed with a single instruction. The matrix for such fold can be calculated by permuting the sub-matrix by the super-matrix at a byte, rather than bit, granularity. This patch: - Folds nested `vgf2p8affineqb` instructions with constant matrix operands into one. - Folds the sub-immediate by performing a affine transformation by the super-matrix. - Can fold non-splat super-matrices if the sub-immediate is zero. - Includes test coverage for complex nested affine transformations, verifying the correctness of the folded matrix and immediate. - Includes negative test coverage for when the fold isn't possible. Fixes #179607
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