[jdk13u-dev] RFR: 8238676: jni crashes on accessing it from process exit hook

[Ekaterina Vergizova]

I would like to backport 8238676 to 13u, it's already included into 11u.

The patch applies almost cleanly except for: 
- changes in make/test/JtregNativeHotspot.gmk reapplied manually due to different context (8179317 is not in 13u)
- the second hunk of src/hotspot/share/prims/jni.cpp reapplied manually due to different context (8234739 is not in 13u) 

Tested with tier1 on Windows, the added test fails without the patch and passes with it.

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Commit messages:
 - Backport c42de93347d1647045f47dda7b50a1cd25db72b5

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/9/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=9&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8238676
  Stats: 220 lines in 4 files changed: 211 ins; 0 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/9.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/9/head:pull/9

PR: https://git.openjdk.java.net/jdk13u-dev/pull/9