RFR: 8224221: add memprotect calls to event log

[Baesken, Matthias]

Hello,  please review  this small changeset .

The current event log holds the last n events of various interesting operations.
It is printed in the hs_err file and helps to analyze various issues / bugs .

I would like to add memory protection events to the current set or events added by calling Events::log .
(we had this for a long time in our  proprietary  VM and  would like to have it in Open JDK too )




Bug/webrev :

https://bugs.openjdk.java.net/browse/JDK-8224221

http://cr.openjdk.java.net/~mbaesken/webrevs/8224221.0/


Thanks, Matthias