Small clean up for PerfClassTraceTime

http://hg.openjdk.java.net/jdk/jdk/file/6181d3acb144/src/hotspot/share/classfile/classLoader.hpp#l440

PARSE_CLASS is unused. This means we can reduce ThreadStatistics::_perf_recursion_counts[] by 1 element.

These two functions are also unused

  inline void suspend() { _t.stop(); _timers[_event_type].stop(); }
  inline void resume() { _t.start(); _timers[_event_type].start(); }