arc.c (arc_return_in_memory): Check the return value of int_size_in_bytes against -1.

arc.c (arc_return_in_memory): Check the return value of int_size_in_bytes against -1.

	* config/arc/arc.c (arc_return_in_memory): Check the return
	value of int_size_in_bytes against -1.  Don't check
	TREE_ADDRESSABLE.
	* config/avr/avr.c (avr_return_in_memory): Check the return
	value of int_size_in_bytes against -1.
	* config/ip2k/ip2k.c (ip2k_return_in_memory): Likewise.
	* config/m68hc11/m68hc11.c (m68hc11_return_in_memory):
	Likewise.
	* config/mcore/mcore.c (mcore_return_in_memory): Likewise.
	* config/stormy16/stormy16.c (xstormy16_return_in_memory):
	Likewise.

From-SVN: r77377