[Bug tree-optimization/95199] Remove extra variable created for memory reference in loop vectorization.

[zhoukaipeng3 at huawei dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95199

--- Comment #2 from Kaipeng Zhou <zhoukaipeng3 at huawei dot com> ---
It seems that IVOPTs has no ability to handle the case where TREE_CODE(iv_step)
is SSA_NAME.