Use ID() in kernel/*, add simple ID:: hack (to be improved upon later)

Signed-off-by: Clifford Wolf <clifford@clifford.at>

kernel/yosys.cc

@@ -511,6 +511,13 @@ void yosys_setup()
 		return;
 	already_setup = true;
 
+	RTLIL::ID::A = "\\A";
+	RTLIL::ID::B = "\\B";
+	RTLIL::ID::Y = "\\Y";
+	RTLIL::ID::keep = "\\keep";
+	RTLIL::ID::whitebox = "\\whitebox";
+	RTLIL::ID::blackbox = "\\blackbox";
+
 	#ifdef WITH_PYTHON
 		PyImport_AppendInittab((char*)"libyosys", INIT_MODULE);
 		Py_Initialize();