[Bug target/56010] Powerpc, -mcpu=native and -mtune=native use the wrong name for target 7450

[bergner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56010

--- Comment #6 from Peter Bergner <bergner at gcc dot gnu.org> ---
Created attachment 43227
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43227&action=edit
Proposed patch

I'm testing the attached patch, which should also fix PR83743.  Can those of
you that have hit this problem test the patch to see if it fixes your specific
failures?