[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 #5 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
Created attachment 44416
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44416&action=edit
C test case for movmem

The movmem from ASes __flash1 ... __flash5 is also affected.  As the place to
fix I'd propose the output function avr.c::avr_out_movmem().