[Bug target/79218] Missed swap optimization on powerpc64le simple test case

[bergner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79218

--- Comment #1 from Peter Bergner <bergner at gcc dot gnu.org> ---
Actually, gcc6 produces the same result (unnecessary swaps) if we use the
-mvsx-timode option, which is not on by default in gcc6.