RFR: 8265129: Add intrinsic support for JVM.getClassId [v2]

[Denghui Dong]

On Fri, 23 Apr 2021 12:37:42 GMT, Denghui Dong <ddong at openjdk.org> wrote:

>> 8265129: Add intrinsic support for JVM.getClassId
>
> Denghui Dong has updated the pull request incrementally with one additional commit since the last revision:
> 
>   add doc

Hi,
Could I have a review of this PR? 
Thanks!

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PR: https://git.openjdk.java.net/jdk/pull/3470