[Bug target/83789] __builtin_altivec_lvx fails for powerpc for altivec-4.c

[kaushikp at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83789

--- Comment #27 from kaushikp at gcc dot gnu.org ---
I have verified the backported patch to GCC-7 and it fixes the issues
I had observed earlier.

Thanks again Peter for this!