[Bug target/88343] [7/8 Regression] R31 is unconditionally saved/restored on powerpc-darwin even when it's not necessary.

[amodra at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88343

--- Comment #27 from Alan Modra <amodra at gmail dot com> ---
And possibly -msecure-plt