Introduce TypeFeedbackVector, as FixedArray grew constrictive.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 4840b2de1963d869e3265036df57ff095be9bfde..8ae3cf8a69249fcfe530a9bb7ed9a265c6713ab7 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -31,6 +31,7 @@
 #include "src/property.h"
 #include "src/prototype.h"
 #include "src/transitions-inl.h"
+#include "src/type-feedback-vector.h"
 #include "src/v8memory.h"
 
 namespace v8 {
@@ -708,6 +709,9 @@ bool Object::IsTransitionArray() const {
 }
 
 
+bool Object::IsTypeFeedbackVector() const { return IsFixedArray(); }
+
+
 bool Object::IsDeoptimizationInputData() const {
   // Must be a fixed array.
   if (!IsFixedArray()) return false;
@@ -5400,7 +5404,7 @@ ACCESSORS(SharedFunctionInfo, name, Object, kNameOffset)
 ACCESSORS(SharedFunctionInfo, optimized_code_map, Object,
                  kOptimizedCodeMapOffset)
 ACCESSORS(SharedFunctionInfo, construct_stub, Code, kConstructStubOffset)
-ACCESSORS(SharedFunctionInfo, feedback_vector, FixedArray,
+ACCESSORS(SharedFunctionInfo, feedback_vector, TypeFeedbackVector,
           kFeedbackVectorOffset)
 ACCESSORS(SharedFunctionInfo, instance_class_name, Object,
           kInstanceClassNameOffset)