RFR: 8292286: Convert PlaceholderTable to ResourceHashtable [v2]

[Coleen Phillimore]

On Mon, 15 Aug 2022 15:26:44 GMT, Harold Seigel <hseigel at openjdk.org> wrote:

>> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Use Symbol::maybe increment or decrement refcount.
>
> src/hotspot/share/classfile/placeholders.hpp line 111:
> 
>> 109:     _supername = supername;
>> 110:     if (_supername != nullptr) _supername->increment_refcount();
>> 111:   }
> 
> Could you use maybe_increment_refcount() instead of checking for NULL in the above code?

Yes, I fixed it to use the maybe version instead.

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PR: https://git.openjdk.org/jdk/pull/9854