[Patch,AVR]: PR50566: Better log output with -mdeb/-mlog= [4/n]

[Georg-Johann Lay]

This is the patch to add log output to LEGITIMIZE_RELOAD_ADDRESS.

The code is moved from macro in avr.h to a new function in avr.c.

Functionality is the same, but IMO it's more convenient to have it as function
than as a quite long macro.

Ok for trunk?

	PR target/50566
	* config/avr/avr-protos.h (avr_legitimize_reload_address): New
	prototype.
	* config/avr/avr.h (LEGITIMIZE_RELOAD_ADDRESS): Copy worker code
	from here...
	* config/avr/avr.c (avr_legitimize_reload_address) ...to this new
	function.  Log if avr_log.legitimize_reload_address.
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