RFR: 8258961: devirtualize SafePointNode::jvms() and hide out set_jvms() [v2]

[Xin Liu]

On Tue, 5 Jan 2021 16:49:25 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: devirtualize SafePointNode::jvms() and hide out set_jvms()
>>   
>>   devirtualize SafePointNode::jvms(). We can't hide the member variable _jvms
>>   because it is exposed to HotSpot Servicability agent. keeping the qualifier
>>   const for the same resaon.
>
> Good.

I investigate the 3 failures on x86 host. they have been fixed in JDK-8258703 (committed yesterday). 
Presumably, the regression tests are clear.  /integrate.

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