[testing] wahey, ecj testing works again, and now we can test JDK16 features in it!

test/stubs/java/lang/Record.java

@@ -0,0 +1,3 @@
+package java.lang;
+
+public abstract class Record {}

test/stubs/java/lang/runtime/ObjectMethods.java

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+package java.lang.runtime;
+
+// import java.lang.invoke.MethodHandle;
+// import java.lang.invoke.MethodHandles;
+// import java.lang.invoke.TypeDescriptor;
+
+public class ObjectMethods {
+// 	public static Object bootstrap(MethodHandles.Lookup lookup, String methodName, TypeDescriptor type, Class<?> recordClass, String names, MethodHandle... getters) throws Throwable {
+	public static Object bootstrap(Object lookup, String methodName, Object type, Class<?> recordClass, String names, Object... getters) throws Throwable {
+		return null;
+    }
+}