RFR: 8265129: Add intrinsic support for JVM.getClassId [v3]

[Denghui Dong]

On Sat, 1 May 2021 09:37:14 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:
> 
>   use new_pointer_register

@egahlin Hi, could you help review this patch?

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