systemc: Add bind() to sc_port_base.

sc_port_base is supposed to be implementation defined, but internal
details of it are relied on by the systemc tests.

Change-Id: I53d84e708a5543a2cf4bd0deffc2efea1c008d97
Reviewed-on: https://gem5-review.googlesource.com/11350
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/systemc/core/sc_port.cc

@@ -39,4 +39,16 @@ sc_port_base::warn_unimpl(const char *func) const
     warn("%s not implemented.\n", func);
 }
 
+void
+sc_port_base::bind(sc_interface &)
+{
+    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
+}
+
+void
+sc_port_base::bind(sc_port_base &)
+{
+    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
+}
+
 } // namespace sc_core

src/systemc/ext/core/sc_port.hh

@@ -52,6 +52,11 @@ class sc_port_base : public sc_object
     {}
 
     void warn_unimpl(const char *func) const;
+
+  protected:
+    // Implementation defined, but depended on by the tests.
+    void bind(sc_interface &);
+    void bind(sc_port_base &);
 };
 
 template <class IF>