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/core/SConscript

@@ -31,6 +31,7 @@ if env['USE_SYSTEMC']:
     SimObject('SystemC.py')
 
     Source('kernel.cc')
+    Source('module.cc')
 
     Source('sc_attr.cc')
     Source('sc_event.cc')