Verilog: add type parameters to scope

Type parameters are now added to the scope, and hence usable as types.

Author: kroening

regression/verilog/modules/type_parameters2.desc

@@ -0,0 +1,7 @@
+CORE
+type_parameters2.sv
+
+^EXIT=0$
+^SIGNAL=0$
+--
+^warning: ignoring

regression/verilog/modules/type_parameters2.sv

@@ -0,0 +1,9 @@
+module main;
+
+  parameter type T1 = bit [31:0];
+
+  T1 some_data;
+
+  initial assert ($bits(some_data) == 32);
+
+endmodule

src/verilog/parser.y

@@ -2031,7 +2031,11 @@ type_assignment: param_identifier '=' data_type
 		  auto base_name = stack_expr($1).id();
 		  stack_expr($$).set(ID_identifier, base_name);
 		  stack_expr($$).set(ID_base_name, base_name);
-		  addswap($$, ID_type, $3); }
+		  addswap($$, ID_type, $3);
+
+		  // add to the scope as a type name
+		  PARSER.scopes.add_name(base_name, "", verilog_scopet::TYPEDEF);
+		}
         ;
 
 data_type_or_implicit: