[Bug target/97367] powerpc64 g5 and cell optimizations result in .machine power7

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97367

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Rebased patch:
https://svn.exactcode.de/t2/trunk/package/develop/gcc/g5-cell-not-power7.patch