[Bug c/115104] RISC-V: GCC-14 can combine vsext+vadd -> vwadd but Trunk GCC (GCC 15) Failed

[juzhe.zhong at rivai dot ai via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115104

--- Comment #1 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
I wonder whether RIVOS CI already found which commit cause this regression ?