RFR: 8143157: Convert TraceVMOperation to Unified Logging

[Rachel Protacio]

Hi,

Please review the following small logging enhancement.

Summary: The former -XX:+TraceVMOperation flag is updated to the unified 
logging framework and is now replaced with -Xlog:vmoperation in product 
mode.

Open webrev: http://cr.openjdk.java.net/~rprotacio/8143157/
Bug: https://bugs.openjdk.java.net/browse/JDK-8143157
Testing: Passes jtreg, JPRT, RBT quick tests, and refworkload 
performance tests.

A compatability request has been accepted with regard to this change.

Thank you very much,
Rachel