Bug ID: JDK-8174856 [TESTBUG] Missing DefineClass instances

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JDK 10	JDK 9
10Fixed	9 b159Fixed

Test: hotspot/test/runtime/Metaspace/DefineClass.java

----------System.out:(9/661)----------
sizeof(DefineClass.class) == 9056
class test.DefineClass
Index Super InstBytes KlassBytes annotations   CpAll MethodCount Bytecodes MethodAll   ROAll   RWAll   Total ClassName
 1594    65         0        296           0    3676          12      1382      3372    3448    4172    7620 test.DefineClass
Should have 2 DefineClass instances and we have: 1
System.gc()
Index Super InstBytes KlassBytes annotations   CpAll MethodCount Bytecodes MethodAll   ROAll   RWAll   Total ClassName
 1735    64         0        296           0    3676          12      1382      3372    3448    4172    7620 test.DefineClass
Should have 2 DefineClass instances and we have: 1
----------System.err:(14/953)----------
java.lang.RuntimeException: Should have 2 DefineClass instances and we have: 1
	at test.DefineClass.printClassStats(DefineClass.java:246)
	at test.DefineClass.main(DefineClass.java:277)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:543)
	at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:110)
	at java.base/java.lang.Thread.run(Thread.java:844)