8170672: Event-based tracing to support classloader instances
Reviewed-by: hseigel, egahlin

8037962: metaspaceTracer.cpp misses a symbol
Reviewed-by: tschatzl, mgerdin
Contributed-by: goetz.lindenmaier@sap.com

8036701: Add trace event when a metaspace throws out of memory error
Reviewed-by: stefank, mgerdin

8036699: Add trace event when a metaspace allocation fails
Reviewed-by: jmasa, stefank

8036698: Add trace event for updates to metaspace gc threshold
Reviewed-by: stefank, mgerdin