re PR target/24265 (ICE: in extract_insn, at recog.c:2084 with -O -fgcse -fmove-loop...

re PR target/24265 (ICE: in extract_insn, at recog.c:2084 with -O -fgcse -fmove-loop-invariants -mtune=pentiumpro)

	PR 24265
	* loop-invariant.c (may_assign_reg_p): Make sure a hard register
	can be assigned to.
	(find_invariant_insn): Do the cheapest check, may_assign_reg_p,
	before check_maybe_invariant.
	(move_invariant_reg): Use gen_move_insn instead of replacing
	SET_DEST with the temporary for the invariant.
	(move_loop_invariants): If checking is enabled, do internal
	consistency checks after completing the pass.

From-SVN: r106795