RFR(L): 8186027: C2: loop strip mining

[Roland Westrelin]

> I was thinking may be we should create new Loop node subclass for outer loop. Then you don't need 
> special flag for it and it will be obvious what they are in Ideal Graph. The same for outer loop end 
> node.

Here is a new webrev with new node types for the outer loop:

http://cr.openjdk.java.net/~roland/8186027/webrev.02/

Roland.