Add Genericity enum in VM to distinguish how a type is uninstantiated.

runtime/vm/parser.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/parser.h"
 #include "vm/flags.h"
 
 #ifndef DART_PRECOMPILED_RUNTIME
 
 #include "lib/invocation_mirror.h"
@@ skipping 12570 matching lines @@
     }
     parent = parent.parent_function();
   }
   return false;
 }
 
 
 bool Parser::InGenericFunctionScope() const {
   if (!innermost_function().IsNull()) {
     // With one more free tag bit in Function, we could cache this information.
-    if (innermost_function().IsGeneric()) {
+    if (innermost_function().IsGeneric() ||
+        innermost_function().HasGenericParent()) {
       return true;
     }
-    Function& parent = Function::Handle(innermost_function().parent_function());
-    while (!parent.IsNull()) {
-      if (parent.IsGeneric()) {
-        return true;
-      }
-      parent = parent.parent_function();
-    }
   }
   return false;
 }
 
 
 void Parser::InsertCachedConstantValue(const Script& script,
                                        TokenPosition token_pos,
                                        const Instance& value) {
   ASSERT(Thread::Current()->IsMutatorThread());
   const intptr_t kInitialConstMapSize = 16;
@@ skipping 2592 matching lines @@
     const ArgumentListNode& function_args,
     const LocalVariable* temp_for_last_arg,
     bool is_super_invocation) {
   UNREACHABLE();
   return NULL;
 }
 
 }  // namespace dart
 
 #endif  // DART_PRECOMPILED_RUNTIME