constructor for object_address_exprt with type

This adds a constructor for object_address_exprt that allows setting the
type, e.g., to get the element type when construcing the address of an
array.

Author: kroening

src/util/pointer_expr.cpp

@@ -122,7 +122,14 @@ address_of_exprt::address_of_exprt(const exprt &_op)
 }
 
 object_address_exprt::object_address_exprt(const symbol_exprt &object)
-  : nullary_exprt(ID_object_address, pointer_type(object.type()))
+  : object_address_exprt(object, pointer_type(object.type()))
+{
+}
+
+object_address_exprt::object_address_exprt(
+  const symbol_exprt &object,
+  pointer_typet type)
+  : nullary_exprt(ID_object_address, std::move(type))
 {
   set(ID_identifier, object.get_identifier());
 }

src/util/pointer_expr.h

@@ -418,6 +418,8 @@ class object_address_exprt : public nullary_exprt
 public:
   explicit object_address_exprt(const symbol_exprt &);
 
+  object_address_exprt(const symbol_exprt &, pointer_typet);
+
   irep_idt object_identifier() const
   {
     return get(ID_identifier);