Request for reviews (S): 7077439: Possible reference through NULL in loopPredicate.cpp:726

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/7077439/webrev

Fixed 7077439: Possible reference through NULL in loopPredicate.cpp:726

VM crashed at the next line because cl->loopexit() == NULL when I tried to port 
7070134 into previous Hotspot sources:

     BoolTest::mask bt = cl->loopexit()->test_trip();

I did not see such crush with latest HS22 sources but it does not mean it can't 
happen. The check cl->is_valid_counted_loop() should be used in the code to 
avoid such crush. Note, this check is superset of cl->stride_is_con() so the 
later could be replaced.