RFR: 8327990: [macosx-aarch64] Various tests fail with -XX:+AssertWXAtThreadSync [v3]

[Richard Reingruber]

> This pr changes  `JfrJvmtiAgent::retransform_classes()` and `jfr_set_enabled` to switch to `WXWrite` before transitioning to the vm.
> 
> Testing:
> make test TEST=jdk/jfr/event/runtime/TestClassLoadEvent.java TEST_VM_OPTS=-XX:+AssertWXAtThreadSync
> make test TEST=compiler/intrinsics/klass/CastNullCheckDroppingsTest.java TEST_VM_OPTS=-XX:+AssertWXAtThreadSync
> 
> More tests are pending.

Richard Reingruber has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'master' into 8327990_jfr_enters_vm_without_wxwrite
 - Set WXWrite at more locations
 - Switch to WXWrite before entering the vm

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/18238/files
  - new: https://git.openjdk.org/jdk/pull/18238/files/9075f4be..1b4d7606

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18238&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18238&range=01-02

  Stats: 293771 lines in 434 files changed: 6197 ins; 6221 del; 281353 mod
  Patch: https://git.openjdk.org/jdk/pull/18238.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18238/head:pull/18238

PR: https://git.openjdk.org/jdk/pull/18238