RFR: 8257726: Make -XX:+StressLdcRewrite option a diagnostic option

[Coleen Phillimore]

On Tue, 15 Dec 2020 23:41:31 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

>> See bug for details.  Tested:
>> 
>> $ java -XX:+StressLdcRewrite -version
>> Error: VM option 'StressLdcRewrite' is diagnostic and must be enabled via -XX:+UnlockDiagnosticVMOptions.
>> Error: The unlock option must precede 'StressLdcRewrite'.
>> Error: Could not create the Java Virtual Machine.
>> Error: A fatal exception has occurred. Program will exit.
>> $ java -XX:+UnlockDiagnosticVMOptions -XX:+StressLdcRewrite -version
>> openjdk version "16-internal" 2021-03-16
>> OpenJDK Runtime Environment (build 16-internal+0-2020-12-15-1356558.coleen...)
>> OpenJDK 64-Bit Server VM (build 16-internal+0-2020-12-15-1356558.coleen..., mixed mode, sharing)
>> 
>> Also, java/lang/instrument which has a test using StressLdcRewrite and tier1.
>
> Thumbs up!

Thanks Lois, Thomas and Dan.

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PR: https://git.openjdk.java.net/jdk/pull/1783