[Bug target/109279] RISC-V: complex constants synthesized should be improved

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109279

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
riscv_split_integer does something similarlly to what I was suggesting but for
some reason it is not kicking in for this case ...