Review request for 6857194

[Mandy Chung]

Karen, Keith,

I add several new perf counters to collect time spent in various aspects 
about class loading.

Webrev:
  http://cr.openjdk.java.net/~mchung/6857194/webrev.00/

Changes:
1. Counters to collect the time spent in defineClass and the byte size 
read.
2. Counters to collect the number of bytes read when parsing a class 
file stream.
The existing sun.cls.loadedBytes and sharedLoadedBytes counter (in 
classLoadingService.cpp - that was carried from 1.4.2) represent the 
footprint of a instanceKlass.  The new counters measure the numbers of 
bytes in the classfile read.

3. Existing class init, class link, and class verify counters include 
the class loading and resolution.  I add the counters to measure the 
exclusive time (i.e. self time) as well.

I ran startup3 on Windows XP.  No significant overhead.
============================================================================== 

mchung.baseline:
Benchmark           Samples        Mean     Stdev             Geomean 
Weight
startup3                 15        2.36      0.04
============================================================================== 

mchung.hsfix:
Benchmark           Samples        Mean     Stdev   %Diff     P  
Significant
startup3                 15        2.35      0.05    0.24 
0.714            *
============================================================================== 


Thanks
Mandy