Remove len argument from RawVec::reserve_for_push Removes `RawVec::reserve_for_push`'s `len` argument since it's always the same as capacity. Also makes `Vec::insert` use `RawVec::reserve_for_push`.
Remove len argument from RawVec::reserve_for_push Removes `RawVec::reserve_for_push`'s `len` argument since it's always the same as capacity. Also makes `Vec::insert` use `RawVec::reserve_for_push`.