Request for review JDK-8187819 gc/TestFullGCALot.java fails on jdk10 started with "-XX:-UseCompressedOops" option

[Alexander Harlap]

Please review change for JDK-8187819 
<https://bugs.openjdk.java.net/browse/JDK-8187819> 
gc/TestFullGCALot.java fails on jdk10 started with 
"-XX:-UseCompressedOops" option.

Change is located at http://cr.openjdk.java.net/~aharlap/8187819/webrev.00/

Initialized metaspace performance counters before their potential use.

Tested - JPRT

Alex