[jdk11u-dev] RFR: 8210429: Clean up JNI_ENV_ARG for vmTestbase/jvmti/Get[G-Z] tests

[Goetz Lindenmaier]

I backport this for parity with 11.0.14-oracle.

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Commit messages:
 - Backport d90f0a51c258a16bbe51f65579dbd5dbb9b18594

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/644/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=644&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8210429
  Stats: 1294 lines in 85 files changed: 0 ins; 1141 del; 153 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/644.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/644/head:pull/644

PR: https://git.openjdk.java.net/jdk11u-dev/pull/644