Print thread dump in truffle native unit test builds on timeout.

Author: jchalou

truffle/mx.truffle/mx_truffle.py

@@ -877,6 +877,7 @@ def truffle_native_context_preinitialization_tests(build_args=None):
 
 
 def truffle_native_unit_tests_gate(use_optimized_runtime=True, build_args=None):
+    jdk = mx.get_jdk(tag='graalvm')
     build_args = build_args if build_args else []
     is_libc_musl = '--libc=musl' in build_args
     is_static = '--static' in build_args
@@ -913,11 +914,13 @@ def truffle_native_unit_tests_gate(use_optimized_runtime=True, build_args=None):
         '-R:MaxHeapSize=2g',
         '-H:MaxRuntimeCompileMethods=5000',
         '--enable-url-protocols=http,jar',
+        '--enable-monitoring=jvmstat',
         '-H:+AddAllCharsets',
         '--add-exports=org.graalvm.polyglot/org.graalvm.polyglot.impl=ALL-UNNAMED',
         '--add-exports=org.graalvm.truffle/com.oracle.truffle.api.impl.asm=ALL-UNNAMED',
         '--enable-native-access=org.graalvm.truffle',
-    ]
+    ] + (mx_sdk_vm_impl.svm_experimental_options(['-H:+DumpThreadStacksOnSignal']) if jdk.version < mx.VersionSpec("24") else
+         ['--enable-monitoring=threaddump'])
     run_args = run_truffle_runtime_args + (['-Xss1m'] if is_libc_musl else []) + [
         mx_subst.path_substitutions.substitute('-Dnative.test.path=<path:truffle:TRUFFLE_TEST_NATIVE>'),
     ]