RFR: 8342854: [JVMCI] Block secondary thread reporting a JVMCI fatal error

[Doug Simon]

A fatal crash on a second thread causes the thread to [sleep infinitely](https://github.com/openjdk/jdk/blob/d6eddcdaf92f2352266ba519608879141997cd63/src/hotspot/share/utilities/vmError.cpp#L1709-L1718) while error reporting continues on the first crashing thread. The same should be done for reporting fatal crashes in libjvmci to avoid interleaving reports. This PR implements this change.

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Commit messages:
 - [JVMCI] Block secondary thread reporting a JVMCI fatal error

Changes: https://git.openjdk.org/jdk/pull/21646/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21646&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342854
  Stats: 12 lines in 2 files changed: 0 ins; 1 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/21646.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21646/head:pull/21646

PR: https://git.openjdk.org/jdk/pull/21646