RFR: 8304138: [JVMCI] Test FailedSpeculation existence before appending. [v2]

[Yudi Zheng]

On Tue, 14 Mar 2023 16:06:38 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Yudi Zheng has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   avoid iterating from beginning.
>
> Good.
> Please, re-test with latest changes.

@vnkozlov could you please review https://github.com/openjdk/jdk/pull/13022/commits/fdf93ae17bad8e4daeaa982d8d43bc49c9550d73  that avoids duplicated FailedSpeculation entries?

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PR: https://git.openjdk.org/jdk/pull/13022