Introduce TypeFeedbackVector, as FixedArray grew constrictive.

src/type-info.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_TYPE_INFO_H_
 #define V8_TYPE_INFO_H_
 
 #include "src/allocation.h"
 #include "src/globals.h"
 #include "src/types.h"
 #include "src/zone-inl.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class SmallMapList;
 
 
 class TypeFeedbackOracle: public ZoneObject {
  public:
   TypeFeedbackOracle(Handle<Code> code,
-                     Handle<FixedArray> feedback_vector,
-                     Handle<Context> native_context,
-                     Zone* zone);
+                     Handle<TypeFeedbackVector> feedback_vector,
+                     Handle<Context> native_context, Zone* zone);
 
   bool LoadIsUninitialized(TypeFeedbackId id);
   bool StoreIsUninitialized(TypeFeedbackId id);
   bool StoreIsKeyedPolymorphic(TypeFeedbackId id);
   bool CallIsMonomorphic(int slot);
   bool CallIsMonomorphic(TypeFeedbackId aid);
   bool KeyedArrayCallIsHoley(TypeFeedbackId id);
   bool CallNewIsMonomorphic(int slot);
 
   // TODO(1571) We can't use ForInStatement::ForInType as the return value due
@@ skipping 77 matching lines @@
   Handle<Object> GetInfo(TypeFeedbackId id);
 
   // Returns an element from the type feedback vector. Returns undefined
   // if there is no information.
   Handle<Object> GetInfo(int slot);
 
  private:
   Handle<Context> native_context_;
   Zone* zone_;
   Handle<UnseededNumberDictionary> dictionary_;
-  Handle<FixedArray> feedback_vector_;
+  Handle<TypeFeedbackVector> feedback_vector_;
 
   DISALLOW_COPY_AND_ASSIGN(TypeFeedbackOracle);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_TYPE_INFO_H_