RFR: 8266637: CHT: Add insert_and_get method

[Ivan Walulya]

On Mon, 17 May 2021 08:28:50 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

>> Hi all,
>> 
>> Please review this change to add an `insert_get` method to the CHT.  The method combines `insert()` and `get()` methods to decrease the amount of global synchronization needed for `get()` calls after an `insert` call. 
>> 
>> Testing: tier1-3
>
> Thanks, looks good!

Thanks @robehn

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PR: https://git.openjdk.java.net/jdk/pull/3915