Fix query java/internal-representation-exposure regarding generic callees, and add a test

java/ql/test/query-tests/ExposeRepresentation/ExposesRep.java

@@ -0,0 +1,30 @@
+import java.util.Map;
+
+public class ExposesRep {
+  private String[] strings;
+  private Map<String, String> stringMap;
+
+  public ExposesRep() {
+    strings = new String[1];
+  }
+
+  public String[] getStrings() { return strings; }
+
+  public Map<String, String> getStringMap() {
+    return stringMap;
+  }
+
+  public void setStrings(String[] ss) {
+    this.strings = ss;
+  }
+
+  public void setStringMap(Map<String, String> m) {
+    this.stringMap = m;
+  }
+}
+
+class GenericExposesRep<T> {
+  private T[] array;
+
+  public T[] getArray() { return array; }
+}