RFR: 8271353: PerfDataManager::destroy crashes in VM_Exit [v2]

[Xin Liu]

On Wed, 28 Jul 2021 16:32:37 GMT, Yumin Qi <minqi at openjdk.org> wrote:

> Hi, Xin
> The copyright year needs updated.
> Maybe '0' is more meaningful than '-1'?

Thanks for the head-up.  I agree that 0 is easier to understand.  I will update it. 
PerfDataManager::add_item() "appends" a PerfData.  if _sampled is not NULL, it should be at least 1.

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PR: https://git.openjdk.java.net/jdk/pull/4913