* target-def.h (TARGET_STRUCT_VALUE_RTX): Define as
	hook_rtx_tree_int_null.
	* targhooks.c (default_struct_value_rtx): Remove.
	* targhooks.h: Remove the prototype for
	default_struct_value_rtx.
	* config/alpha/alpha.c, config/arc/arc.c, config/avr/avr.c,
	config/fr30/fr30.c, config/h8300/h8300.c, config/i386/i386.c,
	config/ip2k/ip2k.c, config/iq2000/iq2000.c,
	config/m32r/m32r.c, config/mcore/mcore.c, config/mips/mips.c,
	config/mn10300/mn10300.c, config/pdp11/pdp11.c,
	config/rs6000/rs6000.c, config/s390/s390.c,
	config/stormy16/stormy16.c, config/v850/v850.c,
	config/xtensa/xtensa.c (TARGET_STRUCT_VALUE_RTX): Remove.
	* doc/tm.texi (TARGET_STRUCT_VALUE_RTX): Document the default.

From-SVN: r77505