[Bug target/121778] Improve rotation detection for RISC-V

[Dusan.Stojkovic--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121778

--- Comment #3 from Dusan Stojkovic <dusan.stojko...@rt-rk.com> ---
Created attachment 62403
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62403&action=edit
The rv64 combine dump