[Bug target/70957] testsuite/gcc.target/powerpc/vsx-elemrev-4.c fails on power7

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70957

--- Comment #4 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
The other odd thing is that we fail only on the signed and unsigned long long
cases, and all of the other variants work.