[jdk17u-dev] RFR: 8327036: [macosx-aarch64] SIGBUS in MarkActivationClosure::do_code_blob reached from Unsafe_CopySwapMemory0

[Richard Reingruber]

This pull request contains a backport of commit [ad1d3248](https://github.com/openjdk/jdk21u-dev/commit/ad1d32484a8130c9b641cff38c07e8544b3fd271) from the [openjdk/jdk21u-dev](https://git.openjdk.org/jdk21u-dev) repository.

With the change the current thread switches to `WXWrite` mode before transitioning into the vm in `JVM_ENTRY_FROM_LEAF`.

Testing:
`test/jdk/sun/nio/cs/FindDecoderBugs.java` with `-XX:+AssertWXAtThreadSync`

The fix passed our CI testing: JTReg tests: tier1-4 of hotspot and jdk. All of Langtools and jaxp. JCK, SPECjvm2008, SPECjbb2015, Renaissance Suite, and SAP specific tests (also with ParallelGC).
Testing was done with fastdebug builds on the main platforms and also on Linux/PPC64le.

Thanks!

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Commit messages:
 - Backport ad1d32484a8130c9b641cff38c07e8544b3fd271

Changes: https://git.openjdk.org/jdk17u-dev/pull/2269/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2269&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327036
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2269.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2269/head:pull/2269

PR: https://git.openjdk.org/jdk17u-dev/pull/2269