[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 #4 from camm at debian dot org ---
Created attachment 33564
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33564&action=edit
additional gdb transcript showing 0 f31 transmitted to return of Lnk23 in L2