Types: cache lub bitset to avoid heap access

test/cctest/test-types.cc

Index: test/cctest/test-types.cc
diff --git a/test/cctest/test-types.cc b/test/cctest/test-types.cc
index d29ee41100f6c3c57080479e4ae7330bbf04385e..57f0b27b007bceeeda41cc2a39d96cb13264c78d 100644
--- a/test/cctest/test-types.cc
+++ b/test/cctest/test-types.cc
@@ -190,10 +190,10 @@ struct ZoneRep {
     return static_cast<int>(reinterpret_cast<intptr_t>(t) >> 1);
   }
   static Map* AsClass(Type* t) {
-    return *reinterpret_cast<Map**>(AsTagged(t)->at(1));
+    return *reinterpret_cast<Map**>(AsTagged(t)->at(2));
   }
   static Object* AsConstant(Type* t) {
-    return *reinterpret_cast<Object**>(AsTagged(t)->at(1));
+    return *reinterpret_cast<Object**>(AsTagged(t)->at(2));
   }
   static ZoneList<Type*>* AsUnion(Type* t) {
     return reinterpret_cast<ZoneList<Type*>*>(AsTagged(t));