Fix DDR hiddenfield iterator

[fengxue-IS]

Signed-off-by: Jack Lu Jack.S.Lu@ibm.com

[babsingh]

jenkins test sanity.functional,extended.functional xlinux jdk8,jdk19

[babsingh]

https://openj9-jenkins.osuosl.org/job/Test_openjdk8_j9_extended.functional_x86-64_linux_Personal/32/tapResults/

The below failure is similar to the failures reported in #15967: Remote host terminated the handshake and SSL peer shut down incorrectly.

This PR is not responsible for the below failure.

Running on [cent6-x64-6](https://openj9-jenkins.osuosl.org/computer/cent6%2Dx64%2D6/) in /home/jenkins/workspace/Test_openjdk8_j9_extended.functional_x86-64_linux_Personal
...
FAILED: testDefaultTls
javax.net.ssl.SSLHandshakeException: Remote host terminated the handshake
	at sun.security.ssl.SSLSocketImpl.handleEOF(SSLSocketImpl.java:1575)
	at sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1405)
	at sun.security.ssl.SSLSocketImpl.readHandshakeRecord(SSLSocketImpl.java:1305)
	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:440)
	at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)
	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:197)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:167)
	at net.adoptopenjdk.test.DefaultTlsFunctionalTest.testDefaultTls(DefaultTlsFunctionalTest.java:72)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:124)
	at org.testng.internal.Invoker.invokeMethod(Invoker.java:580)
	at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:716)
	at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:988)
	at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
	at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
	at org.testng.TestRunner.privateRun(TestRunner.java:648)
	at org.testng.TestRunner.run(TestRunner.java:505)
	at org.testng.SuiteRunner.runTest(SuiteRunner.java:455)
	at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:450)
	at org.testng.SuiteRunner.privateRun(SuiteRunner.java:415)
	at org.testng.SuiteRunner.run(SuiteRunner.java:364)
	at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
	at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:84)
	at org.testng.TestNG.runSuitesSequentially(TestNG.java:1208)
	at org.testng.TestNG.runSuitesLocally(TestNG.java:1137)
	at org.testng.TestNG.runSuites(TestNG.java:1049)
	at org.testng.TestNG.run(TestNG.java:1017)
	at org.testng.TestNG.privateMain(TestNG.java:1354)
	at org.testng.TestNG.main(TestNG.java:1323)
Caused by: java.io.EOFException: SSL peer shut down incorrectly
	at sun.security.ssl.SSLSocketInputRecord.decode(SSLSocketInputRecord.java:167)
	at sun.security.ssl.SSLTransport.decode(SSLTransport.java:109)
	at sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1397)
	... 30 more

[babsingh]

This PR resolves a bug which prevents all hidden fields to be shown for an object in jdmpview.