gcc/
	PR target/81754
	PR target/81268
	* config/avr/avr.opt (mgas-isr-prologues): New Var
	avr_gasisr_prologues.
	* config/avr/avr.md (gasisr, *gasisr): Use it instead of
	TARGET_GASISR_PROLOGUES.
	* config/avr/avr.c (avr_option_override): Same.
	(avr_pass_pre_proep::execute): Same.

From-SVN: r251085