[Bug target/77851] Odd code for _Complex float return value

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77851

--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to H.J. Lu from comment #0)
> It should be simply "ret".

Probably we need to introduce SCmode moves (and maybe also SCmode arithmetic
ops) to handle SCmode that gets passed in a single XMM register.