target/104327: Allow more inlining between different optimization levels.

target/104327: Allow more inlining between different optimization levels.

avr-common.cc introduces the following options that are set depending
on optimization level: -mgas-isr-prologues, -mmain-is-OS-task and
-fsplit-wide-types-early.  The inliner thinks that different options
disallow cross-optimization inlining, so provide can_inline_p.

gcc/
	PR target/104327
	* config/avr/avr.cc (avr_can_inline_p): New static function.
	(TARGET_CAN_INLINE_P): Define to that function.