RFR (XS): 8021301: better event messages

[Albert Noll]

Hi all,

please review this small patch.

jbs: https://jbs.oracle.com/bugs/browse/JDK-8021301
webrev: http://cr.openjdk.java.net/~anoll/8021301/webrev.00/ 
<http://cr.openjdk.java.net/%7Eanoll/8021301/webrev.00/>

Problem:
Having event message printing hex-address is not very helpful:

Event: 57.947 Thread 0x00007f1f3e955800 Threw 0x00000008060c6e90 at 
/HUDSON/workspace/2-build-linux-amd64/jdk8/4338/hotspot/src/share/vm/prims/jvm.cpp:1203

Especially when the address is some temporary symbol address you can't 
not use in a debugger, like for class loading:

EventMark m("loading class " INTPTR_FORMAT, (address)h_name);

Solution:
Make output better readable.

Best,
Albert
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