[jdk11u-dev] RFR: 8210198: Clean up JNI_ENV_ARG for vmTestbase/jvmti/Get[A-F] tests

[Goetz Lindenmaier]

I backport this for parity with 11.0.14-oracle.

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Depends on: https://git.openjdk.java.net/jdk11u-dev/pull/634

Commit messages:
 - Backport d256eb923bfdf82ffd2fa13a5cae3ba4893db050

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/639/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=639&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8210198
  Stats: 839 lines in 56 files changed: 0 ins; 762 del; 77 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/639.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/639/head:pull/639

PR: https://git.openjdk.java.net/jdk11u-dev/pull/639