Fix intermittent LogGeneratedClassesTest failures

Fix intermittent LogGeneratedClassesTest failures by
removing use of lambda expression in static block of
InternalCRIUSupport, which avoids the unexpected
creation of lambda class files for InternalCRIUSupport
during the test.

Issue: #18556
Signed-off-by: Amarpreet Singh <[email protected]>

Author: singh264

jcl/src/java.base/share/classes/openj9/internal/criu/InternalCRIUSupport.java

@@ -231,7 +231,7 @@ private static native void checkpointJVMImpl(String imageDir,
 
 	private static native String[] getRestoreSystemProperites();
 
-	static {
+	private static void initializeUnsafe() {
 		AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
 			try {
 				Field f = Unsafe.class.getDeclaredField("theUnsafe"); //$NON-NLS-1$
@@ -809,6 +809,10 @@ private void registerRestoreEnvVariables() {
 			return;
 		}
 
+		if (unsafe == null) {
+			initializeUnsafe();
+		}
+
 		J9InternalCheckpointHookAPI.registerPostRestoreHook(HookMode.SINGLE_THREAD_MODE, RESTORE_ENVIRONMENT_VARIABLES_PRIORITY,
 				"Restore environment variables via env file: " + envFile, () -> { //$NON-NLS-1$
 					if (!Files.exists(this.envFile)) {