[Bug target/61431] Powerpc tests pack01.c and p8vector-int128-2.c fail on little endian power8 systems

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61431

--- Comment #1 from Michael Meissner <meissner at gcc dot gnu.org> ---
Created attachment 32905
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=32905&action=edit
Proposed patch to fix the problem