RFR: 8287812: Cleanup JDWP agent GetEnv initialization [v2]

[Serguei Spitsyn]

On Fri, 9 Dec 2022 19:44:34 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

> Of course, it is possible that JVMTI_VERSION_9 is compatible with JVMTI_VERSION_1_N and JVMTI_VERSION_11 is compatible with both JVMTI_VERSION_9 and JVMTI_VERSION_1_N. We might have simply bumped the major number because we were in that train of thought back in the JDK9 days...
> I have not checked the compatibility matrices for the various JVM/TI releases in a very, very long time.
As I remember, it was decided in the JDK 9 time frame that we want the JVMTI version to match the JDK version (starting from JDK 9). So that, we always bump JVMTI version in new releases.

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PR: https://git.openjdk.org/jdk/pull/11602