RFR: 8271348: Add stronger sanity check of thread state when polling for safepoint/handshakes [v2]

[Daniel D.Daugherty]

On Mon, 2 Aug 2021 02:39:54 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Daniel D. Daugherty has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   dholmes CR
>
> Marked as reviewed by dholmes (Reviewer).

@dholmes-ora - Thanks for the re-review.

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PR: https://git.openjdk.java.net/jdk/pull/4936