RFR (XS): 8165681 ClassLoad and ClassPrepare JVMTI events are missed in the start phase

[serguei.spitsyn at oracle.com]

Please, review the one-liner fix for:
   https://bugs.openjdk.java.net/browse/JDK-8165681


Webrev:
http://cr.openjdk.java.net/~sspitsyn/webrevs/2016/hotspot/8165681-jvmti-events.hs1/


Summary:
   The JVMTI spec tells the ClassLoad and ClassPrepare events can be 
send during start phase.
   The new test below identified that they are missed because of this 
bug in JVMTI.
   The fix is to add the events to the set of the set of the 
EARLY_EVENT_BITS.

Testing:
   The following new test covers this issue:
test/serviceability/jvmti/ModuleAwareAgents/ClassLoadPrepare/VMEarly
   They are developed as a part of the following test enhancement:
     8150758 [TESTBUG] need jvmti tests for module aware agents

   Additionally, the following tests were run:
     nsk.jvmti, nsk,jdi, jtreg com/sun/jdi and java/lang/instrument


Thanks,
Serguei