Add a test with array in generic type

The JBMC behavior could be changed by array cell propagation in this
case, so a test is needed to ensure we do not introduce a bug.

Author: romainbrenguier

jbmc/regression/jbmc-generics/array/Generic.class

@@ -0,0 +1,27 @@
+class Generic<T> {
+    public T field;
+    public Generic(T fieldParam) {
+        field = fieldParam;
+    }
+}
+
+class IntWrapper {
+  public int i0;
+    public IntWrapper(int intParam) {
+    i0 = intParam;
+  }
+}
+
+public class Test {
+    public static int test(Generic<IntWrapper[]> arrayInput, boolean triggerAssertion) {
+        if (arrayInput != null
+            && arrayInput.field != null
+            && arrayInput.field.length > 0
+            && arrayInput.field[0] != null) {
+            assert(!triggerAssertion);
+            return arrayInput.field[0].i0;
+        } else {
+            return -1;
+        }
+    }
+}