* reload.c (find_reloads_address_1): Handle PLUS expressions resulting

	* reload.c (find_reloads_address_1): Handle PLUS expressions resulting
	from register elimination as PRE_MODIFY / POST_MODIFY increments.
	Do not attempt to handle MEM inside auto-inc expressions.
	* reload1.c (eliminate_regs_1): Do not attempt to handle elimination
	of a register modified by an auto-inc expression.  However, do handle
	elimination of a register used as PRE_MODIFY / POST_MODIFY increment.
	(elimination_effects): Prohibit elimination of a register modified
	by an auto-inc expression.  Disable register elimination rules whose
	target register is modified by an auto-inc expression with variable
	increment.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@122318 138bc75d-0d04-0410-961f-82ee72b054a4