RFR: JDK-8269423: ZGC: Support pinned Object and remove/simplify GCLocker usage in ZGC

[Hamlin Li]

On Thu, 1 Jul 2021 09:21:33 GMT, Hamlin Li <mli at openjdk.org> wrote:

> This PR is not an real intention to push current implementation, and current implementation does not support ZVerifyViews (which was pointed out by Per at https://github.com/openjdk/jdk/pull/4638#issuecomment-872033165).
> 
> Let's see if this solution is feasible and how to support ZVerifyViews efficiently.

I see your points, thanks for the deailed comments!
I'm OK to close the PR for now, and will come back then to investigate the issue to see if there will be better solution.

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PR: https://git.openjdk.java.net/jdk/pull/4650