PR target/80125
	* combine.c (can_combine_p): Revert the 2017-03-20 change, only
	check reg_used_between_p between insn and one of succ or succ2
	depending on if succ is artificial insn not inserted into insn
	stream.

	* gcc.target/powerpc/pr80125.c: New test.

Co-Authored-By: Segher Boessenkool <segher@kernel.crashing.org>

From-SVN: r246323