systemc: Construct and manage a module name stack.

Change-Id: I5f7f64d6c3d7e08ec6d2529f3c5d84fbfc2c421b
Reviewed-on: https://gem5-review.googlesource.com/10850
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/systemc/ext/core/sc_module_name.hh

@@ -30,6 +30,13 @@
 #ifndef __SYSTEMC_EXT_CORE_SC_MODULE_NAME_HH__
 #define __SYSTEMC_EXT_CORE_SC_MODULE_NAME_HH__
 
+namespace sc_gem5
+{
+
+class Module;
+
+} // namespace sc_gem5
+
 namespace sc_core
 {
 
@@ -44,6 +51,7 @@ class sc_module_name
 
   private:
     const char *_name;
+    sc_gem5::Module *_gem5_module;
     bool _on_the_stack;
 
     // Disabled