[mlir] [clang-tools-extra] [clang] [llvm] [MLIR][Linalg] Support dynamic sizes in `lower_unpack` (PR #75494)

[lorenzo chelini via cfe-commits]

https://github.com/chelini approved this pull request.

Thanks, it looks good to me. 

https://github.com/llvm/llvm-project/pull/75494