8284072: foreign/StdLibTest.java randomly crashes on MacOS/AArch64

Reviewed-by: jvernee, mcimadamore

Author: nick-arm

src/hotspot/share/prims/upcallLinker.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2020, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -72,6 +72,10 @@ JavaThread* UpcallLinker::on_entry(UpcallStub::FrameData* context) {
   // clear any pending exception in thread (native calls start with no exception pending)
   thread->clear_pending_exception();
 
+  // The call to transition_from_native below contains a safepoint check
+  // which needs the code cache to be writable.
+  MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, thread));
+
   // After this, we are officially in Java Code. This needs to be done before we change any of the thread local
   // info, since we cannot find oops before the new information is set up completely.
   ThreadStateTransition::transition_from_native(thread, _thread_in_Java, true /* check_asyncs */);