RFR: 8212879: Make JVMTI TagMap table concurrent [v4]

[Serguei Spitsyn]

On Tue, 3 Nov 2020 21:41:55 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> > @coleenp - please make sure you hear from someone on the Serviceability team
> > for this PR...
> 
> I've asked @sspitsyn to review this.

Yes, I'm reviewing this. Still need another pass.

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PR: https://git.openjdk.java.net/jdk/pull/967