RFR(XS): 8194914: Compilation fails with "node not on backedge" in OuterStripMinedLoopNode::adjust_strip_mined_loop

[Roland Westrelin]

http://cr.openjdk.java.net/~roland/8194914/webrev.00/

The strip mined loop has a load on the backedge with a control which is
not the backedge. The load is pushed on the backedge by a store that is
pinned there. The assert is too strong.

Roland.