RFR: 8012210: Make TracingTime available when INCLUDE_TRACE = 0

[Rickard Bäckman]

Hi all,

can I have a couple of small fixes for this change? 
The purpose of the change is to make it easier to write events without having to put them inside a #ifdef INCLUDE_TRACE.
The idea is that when INCLUDE_TRACE is false the code should be no-ops. 

The webrev: http://cr.openjdk.java.net/~rbackman/8012210/

Thanks
/R