RFR: 8272348: Update CDS tests in anticipation of JDK-8270489 [v2]

[Ioi Lam]

On Thu, 12 Aug 2021 05:46:33 GMT, Igor Ignatyev <iignatyev at openjdk.org> wrote:

>> Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fixed copyright year
>
> test/lib/sun/hotspot/WhiteBox.java line 596:
> 
>> 594:   public native boolean isSharedClass(Class<?> c);
>> 595:   public native boolean areSharedStringsMapped();
>> 596:   public native boolean isSharedInternedString(String s);
> 
> please also update `jdk.test.whitebox.WhiteBox`

I have synced jdk/test/whitebox/WhiteBox.java to match the latest APIs in sun/hotspot/WhiteBox.java

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PR: https://git.openjdk.java.net/jdk/pull/5095