[Bug target/63360] Does not retore f31 at -O0 across function calls

[camm at debian dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63360

--- Comment #15 from camm at debian dot org ---
Created attachment 33575
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33575&action=edit
setjmp saves f31, then zeroes out the result with stvx    v3,0,r5