hg: jdk/sandbox: 8236901: 8232759 missed a test case

[chris.hegarty at oracle.com]

Changeset: 2189f1e9bab1
Author:    coleenp
Date:      2020-01-17 06:56 -0500
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/2189f1e9bab1

8236901: 8232759 missed a test case
Summary: Use jcmd GC.class-histogram because it also works for verifying that the classes are loaded.
Reviewed-by: dholmes, mseledtsov, iklam

! src/hotspot/share/memory/heapInspection.cpp
! src/hotspot/share/prims/whitebox.cpp
! test/hotspot/jtreg/ProblemList.txt
! test/hotspot/jtreg/runtime/Metaspace/DefineClass.java
! test/lib/sun/hotspot/WhiteBox.java