[Bug target/86040] [avr]: RAMPZ is not always cleared after loading __flashN data

[gjl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86040

--- Comment #6 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
Created attachment 47009
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47009&action=edit
proposed patch