RFR: 8271862: C2 intrinsic for Reference.refersTo() is often not used [v2]

[Per Liden]

On Mon, 9 Aug 2021 19:59:21 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

>> Per Liden has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Private implies final
>
> src/java.base/share/classes/java/lang/ref/Reference.java line 379:
> 
>> 377: 
>> 378:     @IntrinsicCandidate
>> 379:     private native final boolean refersTo0(Object o);
> 
> No need to have it both `private` and `final`.  Just `private` should be enough.

Good point. Fixed.

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PR: https://git.openjdk.java.net/jdk/pull/5052