[jdk11u-dev] RFR: 8273373: Zero: Cannot invoke JVM in primordial threads on Zero

[Aleksey Shipilev]

This fixes gtests with Zero.

Additional testing:
 - [x] gtests now run mostly fine with Linux x86_64 Zero, with unrelated failures fixed by subsequent backports

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Commit messages:
 - Backport 0f31d0fb2c0d5db305e75e1d61bcc44de3e77839

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/458/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=458&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273373
  Stats: 29 lines in 2 files changed: 17 ins; 12 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/458.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/458/head:pull/458

PR: https://git.openjdk.java.net/jdk11u-dev/pull/458