Faster iteration over non-offset `AbstractVector` (#48720)
This change simplifies the boundscheck in loop as LLVM would lift the const subtraction.
Simd block would be generated in more cases.
Co-authored-by: N5N3 <2642243996@qq.com>
(cherry picked from commit 1543cdd5ffc734cae640e45b9bb6ada73dd81c02)