Fix pack_2d_to_4d_by_8x4_blocks test
Fix pack_2d_to_4d_by_8x4_blocks test

PiperOrigin-RevId: 381153052

iree-org/iree-llvm-sandbox,iree-org/iree-llvm-sandbox,iree-org/iree-llvm-sandbox,iree-org/iree-llvm-sandbox