Use kFunctionCid instead of kIllegalCid to indicate that a generic function

runtime/vm/object.h

 // 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.
 
 #ifndef RUNTIME_VM_OBJECT_H_
 #define RUNTIME_VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 6039 matching lines @@
   virtual bool IsMalbounded() const { return false; }
   virtual bool IsMalformedOrMalbounded() const { return false; }
   virtual bool IsResolved() const { return true; }
   virtual bool HasResolvedTypeClass() const { return false; }
   classid_t parameterized_class_id() const;
   RawClass* parameterized_class() const;
   RawFunction* parameterized_function() const {
     return raw_ptr()->parameterized_function_;
   }
   bool IsClassTypeParameter() const {
-    return parameterized_class_id() != kIllegalCid;
+    return parameterized_class_id() != kFunctionCid;
   }
   bool IsFunctionTypeParameter() const {
     return parameterized_function() != Function::null();
   }
   RawString* name() const { return raw_ptr()->name_; }
   intptr_t index() const { return raw_ptr()->index_; }
   void set_index(intptr_t value) const;
   intptr_t parent_level() const { return raw_ptr()->parent_level_; }
   RawAbstractType* bound() const { return raw_ptr()->bound_; }
   void set_bound(const AbstractType& value) const;
@@ skipping 2815 matching lines @@
 
 inline void TypeArguments::SetHash(intptr_t value) const {
   // This is only safe because we create a new Smi, which does not cause
   // heap allocation.
   StoreSmi(&raw_ptr()->hash_, Smi::New(value));
 }
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_OBJECT_H_