Migrate Java code to separate QL repo.

java/ql/test/query-tests/NonSynchronizedOverride/Test.java

@@ -0,0 +1,44 @@
+class Super {
+	synchronized void quack() {
+		System.out.println("Quack.");
+	}
+	
+	synchronized Super self() {
+		return this;
+	}
+	
+	synchronized void foo() {}
+	void bar() {}
+}
+
+class Sub extends Super {
+	// NOT OK
+	void quack() {
+		super.quack();
+		super.quack();
+	}
+	
+	// OK
+	Sub self() {
+		return (Sub)super.self();
+	}
+	
+	// NOT OK
+	void foo() {
+		super.bar();
+	}
+}
+
+class A<T> {
+	synchronized void foo() {}
+}
+
+class B extends A<Integer> {
+	// NOT OK
+	void foo() {}
+}
+
+class C extends A<String> {
+	// NOT OK
+	void foo() {}
+}