[Bug target/68872] -mcpu=powerpc64le does not pass -mpower8 to gas

[bergner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68872

--- Comment #1 from Peter Bergner <bergner at gcc dot gnu.org> ---
As I mentioned in the binutils bug, I think -mcpu=powerpc64le should mimic
-mcpu=power8.  I'll have a look at making that change.