[Lilliput] Test fix for EATests after backport

Summary: Change unsupported test api

Testing: com/sun/jdi/EATests.java

Reviewers: mmyxym, jia-wei-tang

Issue: #132

test/jdk/com/sun/jdi/EATests.java

@@ -1999,7 +1999,7 @@ public void warmupDone() {
         // Use new lock. lockInflatedByContention might have been inflated because of recursion.
         lockInflatedByContention = new XYVal(1, 1);
         // Start thread that tries to enter lockInflatedByContention while the main thread owns it -> inflation
-        TestScaffold.newThread(() -> {
+        DebuggeeWrapper.newThread(() -> {
             while (true) {
                 synchronized (testCase) {
                     try {