RFR: 8258961: move some fields of SafePointNode from public to protected [v5]

[Xin Liu]

On Mon, 18 Jan 2021 22:32:32 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Xin Liu has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8258961: move some fields of SafePointNode from public to protected
>>   
>>   revert code change to devirtualize Node::jvms().
>>   There are 3 nodes override jvms() --  SafePointNode, MachSafePointNode and
>>   MachHalt. It does not make sense to devirtualize it because we have to do
>>   non-trivial dispatch based on types in Node::jvms(). It is not worth it.
>
> Looks good.
> 
> Latest version passed hs-tier1-3 testing.

Thanks for all reviewers.

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PR: https://git.openjdk.java.net/jdk/pull/1899