Added test for loading Foo<?> type from Java.

compiler/testData/loadJava/UnboundWildcard.java

@@ -0,0 +1,10 @@
+package test;
+
+public final class UnboundWildcard {
+    public final MyClass<?> foo() {
+        throw new UnsupportedOperationException();
+    }
+
+    public interface MyClass<T extends CharSequence> {
+    }
+}