re PR rtl-optimization/88948 (ICE in elimination_costs_in_insn, at reload1.c:3640...

re PR rtl-optimization/88948 (ICE in elimination_costs_in_insn, at reload1.c:3640 since r264148)

	PR target/88948
	* rtl.h (prepare_copy_insn): New prototype.
	* gcse.c (prepare_copy_insn): New function, split out from
	process_insert_insn.
	(process_insert_insn): Use prepare_copy_insn.
	* store-motion.c (replace_store_insn): Use prepare_copy_insn
	instead of gen_move_insn.

testsuite/ChangeLog:

	PR target/88948
	* gcc.target/i386/pr88948.c: New test.

From-SVN: r268249