Fix i4 transfer_read/transfer_write lowerings.
Fix i4 transfer_read/transfer_write lowerings.

LLVM and XLA pack i4s in opposite orders, so we have to permute the
vector elements.

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/13461 from knightXun:transpose-typo e7c6c23be44648237a31d17bf2574c4f26510889
