RFR: 8253748: StressIGV tests fail with release VMs

[Tobias Hartmann]

On Mon, 28 Sep 2020 23:47:48 GMT, Jie Fu <jiefu 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.

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Marked as reviewed by thartmann (Reviewer).

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