[Bug target/64703] glibc sysdeps/powerpc/powerpc64/dl-machine.h miscompile

[amodra at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64703

--- Comment #7 from Alan Modra <amodra at gmail dot com> ---
Created attachment 34539
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34539&action=edit
prototype patch

How does this look as a potential fix?  Obviously I'd need to provide the new
targetm field and arrange for it to be set on powerpc64 elfv1, but before I do
that I'd like some indication that this is going in the right direction.