predicates (post_inc_mem, [...]): New predicates.

predicates (post_inc_mem, [...]): New predicates.

gcc/
	* config/sh/predicates (post_inc_mem, pre_dec_mem): New predicates.
	* config/sh/sh-protos.h (sh_find_set_of_reg): Return null result if
	result.set_rtx is null instead of aborting.
	* config/sh/sh.h (USE_LOAD_POST_INCREMENT, USE_STORE_PRE_DECREMENT):
	Always enable.
	(USE_LOAD_PRE_DECREMENT, USE_STORE_POST_INCREMENT): Enable for SH2A.
	* config/sh/sh.md (*extend<mode>si2_predec, *mov<mode>_load_predec,
	*mov<mode>_store_postinc): New patterns.

From-SVN: r235859