AVR: target/122527 -- Don't use __load_N to load from __flash1.

AVR: target/122527 -- Don't use __load_N to load from __flash1.

This patch fixes a case where a 3 byte or 4 byte load from __flash1
uses __load_3/4 to read the value, which is wrong.

This only occured when the device has ELPM but not ELPMx (avr31).

	PR target/122527
gcc/
	* config/avr/avr.cc (avr_load_libgcc_p): Return false if
	the address-space is not ADDR_SPACE_FLASH.
	(avr_out_lpm_no_lpmx [addr=REG]): Handle sizes of 3 and 4 bytes.