RFR: 8253748: StressIGV tests fail with release VMs

[Jie Fu]

On Tue, 29 Sep 2020 06:00:42 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> The following StressIGV tests fails with release VMs
>>   - compiler/arguments/TestStressIGVNOptions.java
>>   - compiler/debug/TestGenerateStressSeed.java
>>   - compiler/debug/TestStressIGVN.java
>> 
>> The reason is that VM option 'StressIGVN' is diagnostic and must be enabled via -XX:+UnlockDiagnosticVMOptions.
>> 
>> The fix adds '-XX:+UnlockDiagnosticVMOptions' option.
>> And compiler/debug/TestStressIGVN.java should be only available for debug VMs since it depends
>> on -XX:+TraceIterativeGVN.
>
> Looks good and trivial.

Thanks @TobiHartmann for your review.

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PR: https://git.openjdk.java.net/jdk/pull/390