[Bug tree-optimization/88739] [7 Regression] Big-endian union bug

[dongjianqiang2 at huawei dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88739

--- Comment #58 from John Dong <dongjianqiang2 at huawei dot com> ---
Created attachment 46022
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46022&action=edit
fix the union bug on 7.3.0