RFR (xs) 8190491: SA tests failed after 8189610 changes

[coleen.phillimore at oracle.com]

Summary: Changed a type in hotspot not reflected in SA code.

open webrev at http://cr.openjdk.java.net/~coleenp/8190491.01/webrev
bug link https://bugs.openjdk.java.net/browse/JDK-8190491

Ran test/hotspot/serviceability/sa and gc/metaspace tests locally with 
fix, tier1 testing locally in progress.  I'll run more tests if we wish 
to wait.

Thanks,
Coleen