RFR: 8142976: TraceClassInitialization has been reimplemented with Unified Logging.

[Max Ockner]

Hello,
Please review my new unified logging code:

Bug: https://bugs.openjdk.java.net/browse/JDK-8142976
http://cr.openjdk.java.net/~mockner/ulclassinit01/src/share/vm/classfile/verifier.cpp.cdiff.html
Summary: -XX:+TraceClassInitialization logging has been reimplemented 
using unified logging under the classinit tag.

In the segment with recursive verification (see verifier.cpp) I 
reordered the nested if statement to check was_recursively_verified() 
first. I valued clean code over potentially avoiding a function call to 
was_recursively_verified.

What do you think?

Tested with:
jtreg hotspot tests
new jtreg test for classinit tag
performance testing with refworkload.

Thanks, Max