Introduce TypeFeedbackVector, as FixedArray grew constrictive.

src/type-info.cc

Index: src/type-info.cc
diff --git a/src/type-info.cc b/src/type-info.cc
index f606ce20578dc67d4af3ffa7cde4fbcdf2266642..07c772e980d0c295668c65470b993967f7fbcfbd 100644
--- a/src/type-info.cc
+++ b/src/type-info.cc
@@ -18,19 +18,17 @@ namespace v8 {
 namespace internal {
 
 
-TypeFeedbackOracle::TypeFeedbackOracle(Handle<Code> code,
-                                       Handle<FixedArray> feedback_vector,
-                                       Handle<Context> native_context,
-                                       Zone* zone)
-    : native_context_(native_context),
-      zone_(zone) {
+TypeFeedbackOracle::TypeFeedbackOracle(
+    Handle<Code> code, Handle<TypeFeedbackVector> feedback_vector,
+    Handle<Context> native_context, Zone* zone)
+    : native_context_(native_context), zone_(zone) {
   BuildDictionary(code);
   DCHECK(dictionary_->IsDictionary());
   // We make a copy of the feedback vector because a GC could clear
   // the type feedback info contained therein.
   // TODO(mvstanton): revisit the decision to copy when we weakly
   // traverse the feedback vector at GC time.
-  feedback_vector_ = isolate()->factory()->CopyFixedArray(feedback_vector);
+  feedback_vector_ = TypeFeedbackVector::Copy(isolate(), feedback_vector);
 }