[9] RFR (XS): 8036748: assert(_base == Int) failed: Not an Int w/ -XX:+TraceIterativeGVN

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8036748/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8036748

Debug builds sometime crash w/ -XX:+TraceIterativeGVN.

The fix is an update to the dumping check in 
CallStaticJavaNode::extract_uncommon_trap_request() to ensure the 
bottom_type is an TypeInt.

Testing: manual.

Best regards,
Vladimir Ivanov