[mlir][vector] Update helpers in `VectorEmulateNarrowType.cpp` (nfc)#131527

banach-space merged 2 commits intollvm:mainllvm/llvm-project:mainfrom

banach-space:andrzej/narrow_type/unify_extract_insert_hooksbanach-space/llvm-project:andrzej/narrow_type/unify_extract_insert_hooksCopy head branch name to clipboard