RFR: 8303489: Add a test to verify classes in vmStruct have unique vtables [v2]

[Alex Menkov]

On Thu, 2 Mar 2023 22:20:10 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>> Alex Menkov has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   addressed feedback
>
> test/hotspot/jtreg/serviceability/sa/UniqueVtableTest.java line 85:
> 
>> 83:         int dupsFound = 0;
>> 84:         // agent.getTypeDataBase() returns HotSpotTypeDataBase (extends BasicTypeDataBase)
>> 85:         BasicTypeDataBase typeDB = (BasicTypeDataBase)(agent.getTypeDataBase());
> 
> I don't think the cast is needed.

agent.getTypeDataBase() returns TypeDataBase, we need BasicTypeDataBase

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PR: https://git.openjdk.org/jdk/pull/12820