8179040: Avoid Ticks::now calls when EventClassLoad is not enabled
Reviewed-by: ehelin, mgronlun, dholmes, iklam
Contributed-by: claes.redestad@oracle.com, markus.gronlund@oracle.com

8170847: Refactor trace/traceStream.hpp
Reviewed-by: coleenp, lfoltan

8143226: Minor updates to Event Based tracing
Reviewed-by: jbachorik, egahlin

8138562: Event based tracing should cover monitor inflation
Reviewed-by: dcubed, egahlin, mgronlun

8145788: JVM crashes with -XX:+EnableTracing
Reviewed-by: dholmes, ysuenaga, mlarsson

8065361: Fixup headers and definitions for INCLUDE_TRACE
Reviewed-by: sla, stefank

8064348: Add TraceEvent::is_enabled() for embedded/minimal builds
Reviewed-by: ehelin, sla

8028128: Add a type safe alternative for working with counter based data
Reviewed-by: dholmes, egahlin

8026703: Wrongly placed <xsl:import> element in Event-Based JVM Tracing .xsl files
Reviewed-by: sla, kamg

8005849: JEP 167: Event-Based JVM Tracing
Reviewed-by: acorn, coleenp, sla
Contributed-by: Karen Kinnear <karen.kinnear@oracle.com>, Bengt Rutisson <bengt.rutisson@oracle.com>, Calvin Cheung <calvin.cheung@oracle.com>, Erik Gahlin <erik.gahlin@oracle.com>, Erik Helin <erik.helin@oracle.com>, Jesper Wilhelmsson <jesper.wilhelmsson@oracle.com>, Keith McGuigan <keith.mcguigan@oracle.com>, Mattias Tobiasson <mattias.tobiasson@oracle.com>, Markus Gronlund <markus.gronlund@oracle.com>, Mikael Auno <mikael.auno@oracle.com>, Nils Eliasson <nils.eliasson@oracle.com>, Nils Loodin <nils.loodin@oracle.com>, Rickard Backman <rickard.backman@oracle.com>, Staffan Larsen <staffan.larsen@oracle.com>, Stefan Karlsson <stefan.karlsson@oracle.com>, Yekaterina Kantserova <yekaterina.kantserova@oracle.com>