Introduce TypeFeedbackVector, as FixedArray grew constrictive.

src/bootstrapper.cc

 // Copyright 2014 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.
 
 #include "src/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/code-stubs.h"
 #include "src/extensions/externalize-string-extension.h"
 #include "src/extensions/free-buffer-extension.h"
@@ skipping 1942 matching lines @@
     // Install the call and the apply functions.
     Handle<JSFunction> call =
         InstallFunction(proto, "call", JS_OBJECT_TYPE, JSObject::kHeaderSize,
                         MaybeHandle<JSObject>(), Builtins::kFunctionCall);
     Handle<JSFunction> apply =
         InstallFunction(proto, "apply", JS_OBJECT_TYPE, JSObject::kHeaderSize,
                         MaybeHandle<JSObject>(), Builtins::kFunctionApply);
     if (FLAG_vector_ics) {
       // Apply embeds an IC, so we need a type vector of size 1 in the shared
       // function info.
-      Handle<FixedArray> feedback_vector = factory()->NewTypeFeedbackVector(1);
+      Handle<TypeFeedbackVector> feedback_vector =
+          factory()->NewTypeFeedbackVector(1);
       apply->shared()->set_feedback_vector(*feedback_vector);
     }
 
     // Make sure that Function.prototype.call appears to be compiled.
     // The code will never be called, but inline caching for call will
     // only work if it appears to be compiled.
     call->shared()->DontAdaptArguments();
     DCHECK(call->is_compiled());
 
     // Set the expected parameters for apply to 2; required by builtin.
@@ skipping 741 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 } }  // namespace v8::internal