Fix quirk where parameter override across multiple elaborations would use cached default value. #166

Author: amykyta3

systemrdl/compiler.py

@@ -379,6 +379,7 @@ def elaborate(self, top_def_name: Optional[str]=None, inst_name: Optional[str]=N
                 self.msg.fatal("Incorrect type for top-level parameter override of '%s'" % param_name)
 
             parameter.expr = assign_expr
+            parameter._value = None # Ensure cached value is cleared
 
 
         # instantiate top_inst into the root component instance