Support parameter value ranges on localparams

Verilog-AMS defines parameter value ranges which can restrict the value
that can be assigned to a parameter. It defines this for both `parameter`
and `localparam`. Currently it is only implemented for `parameter`. Support
it for `localparam` as well for consistency.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

parse.y

@@ -5688,10 +5688,10 @@ parameter_assign
   ;
 
 localparam_assign
-  : IDENTIFIER '=' expression
+  : IDENTIFIER '=' expression parameter_value_ranges_opt
       { PExpr*tmp = $3;
 	pform_set_parameter(@1, lex_strings.make($1), true, param_data_type,
-			    tmp, 0);
+			    tmp, $4);
 	delete[]$1;
       }
   ;