RFR: 8340233: Missed ThreadWXEnable in jfrNativeLibraryLoadEvent.cpp

[Leonid Mesnik]

The bug is reproduced and fix verified by running 
java/lang/ClassLoader/loadLibraryUnload/LoadLibraryUnloadTest.java with JFR enabled.

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Commit messages:
 - fix

Changes: https://git.openjdk.org/jdk/pull/21028/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21028&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340233
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21028.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21028/head:pull/21028

PR: https://git.openjdk.org/jdk/pull/21028