rtlanal.c (generic_subrtx_iterator <T>::add_subrtxes_to_queue): Add the parts of an insn in reverse order, with the pattern at the top of the queue.

gcc/
	* rtlanal.c (generic_subrtx_iterator <T>::add_subrtxes_to_queue):
	Add the parts of an insn in reverse order, with the pattern at
	the top of the queue.  Detect when we're iterating over a SEQUENCE
	pattern and in that case just consider patterns of subinstructions.

From-SVN: r216137