During the code review of:

    JDK-8227338 templateInterpreter.cpp: copy_table() needs to be safer
    https://bugs.openjdk.java.net/browse/JDK-8227338

The possibility of making TemplateInterpreter::_active_table volatile
in order to limit C++ compiler optimizations was raised. This type
of change will ripple into the various functions that manage the
_active_table.

Coleen also wonders what needs to happen to the _active_table
logic when we eventually only have handshakes for safepoints.