RFR: 8163589: Add back intrinsic methods for event based tracing

[Robbin Ehn]

Hi all,

In 8 we had this intrinsic, I'm adding it back
Used for event based tracing.

Webrev: http://cr.openjdk.java.net/~rehn/8163589/hotspot.01/webrev/
Bug: https://bugs.openjdk.java.net/browse/JDK-8163589

Thanks!

/Robbin