[Bug target/113950] PowerPC, ICE with -O1 or higher compiling __builtin_vsx_splat_2di test case

[bergner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113950

--- Comment #4 from Peter Bergner <bergner at gcc dot gnu.org> ---
The bogus vsx_splat_<mode> code goes all the way back to GCC 8, so we need
backports to the open release branches (GCC 13, 12, 11).