RFR: 8271931: Make AbortVMOnVMOperationTimeout more resilient to OS scheduling [v5]

[David Holmes]

On Mon, 9 Aug 2021 08:42:59 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Perform VM-op timeout also on the VM thread. If a VM-op is stuck, the existing watcher-thread based machinery will kick in and detect it.
>> 
>> Test: tier1
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove vmthread assert

Marked as reviewed by dholmes (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5016