systemc: Add the nonstandard sc_hierarchical_name_exists function.

Change-Id: I1340bb6cb0ae29d81b5d73b3dd39ebb11c14802c
Reviewed-on: https://gem5-review.googlesource.com/11280
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/systemc/core/sc_module.cc

@@ -614,6 +614,13 @@ sc_gen_unique_name(const char *)
     return "";
 }
 
+bool
+sc_hierarchical_name_exists(const char *name)
+{
+    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
+    return false;
+}
+
 bool
 sc_start_of_simulation_invoked()
 {

src/systemc/ext/core/_using.hh

@@ -93,6 +93,7 @@ using sc_core::next_trigger;
 using sc_core::wait;
 using sc_core::halt;
 using sc_core::sc_gen_unique_name;
+using sc_core::sc_hierarchical_name_exists;
 using sc_core::sc_behavior;
 using sc_core::sc_channel;
 using sc_core::sc_start_of_simulation_invoked;

src/systemc/ext/core/sc_module.hh

@@ -272,6 +272,9 @@ void at_negedge(const sc_signal_in_if<sc_dt::sc_logic> &);
 
 const char *sc_gen_unique_name(const char *);
 
+// Nonstandard
+bool sc_hierarchical_name_exists(const char *name);
+
 typedef sc_module sc_behavior;
 typedef sc_module sc_channel;