RFR: 8245455: Remove alternative StringConcatFactory strategies

[Mandy Chung]

Has that system property ever documented in CSR?    It's not in CSR for 
JEP 280 [1].   Maybe other CSR?

Mandy
[1] https://bugs.openjdk.java.net/browse/CCC-8085796

On 5/23/20 6:18 AM, David Holmes wrote:
> Hi Claes,
>
> You are removing a property so this needs a CSR request.
>
> Thanks,
> David
>
> On 22/05/2020 7:52 pm, Claes Redestad wrote:
>> Hi,
>>
>> this patch removes the alternative, undocumented strategies from
>> StringConcatFactory.
>>
>> The default strategy has been optimized and stabilized since 
>> inception in JDK 9, while the alternative strategies have been 
>> falling behind
>> both in terms of performance and stability - while adding maintenance
>> cost.
>>
>> The removal allows some simplifications to the code that will reduce
>> per callsite bootstrap overhead, and reduce what we need to load eagerly
>> during bootstrap. I've also applied the pattern from JDK-8218173 to
>> the remaining Stringifier method handles, which further improve
>> robustness of bootstrapping under an OOME condition.
>>
>> Webrev: http://cr.openjdk.java.net/~redestad/8245455/open.00/
>> Bug:    https://bugs.openjdk.java.net/browse/JDK-8245455
>>
>> Testing: tier1-3
>>
>> Thanks!
>>
>> /Claes