* tree-ssa-loop-ivopts.c (iv_ca_narrow): New parameter.
	Start narrowing with START.  Apply candidate-use pair
	and check overall cost in narrowing.
	(iv_ca_prune): Pass new argument.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@206552 138bc75d-0d04-0410-961f-82ee72b054a4