reg-stack.c (next_flags_user): Use current_block->end

reg-stack.c (next_flags_user): Use current_block->end

	* reg-stack.c (next_flags_user): Use current_block->end
	(swap_rtx_condition): Look for next user if flags don't die;
	give up on CALL_INSNs; use current_block->end.

From-SVN: r39884