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

[Alex Menkov]

On Thu, 2 Mar 2023 22:24:35 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 94:
> 
>> 92:             Address vtable = typeDB.vtblForType(t);
>> 93:             if (vtable != null) {
>> 94:                 no_vtable++;
> 
> `no_vtable` is actually tracking the number of Types with a vtable.

Changed reported stats

-------------

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