Simplify feedback vector creation and store in SharedFunctionInfo.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 3c3b187f7d02b9b497c47b01eca0de1f4aa58efb..b3f79a182897ec52afc052f227e8276fd624b784 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -179,7 +179,6 @@ Handle<TypeFeedbackInfo> Factory::NewTypeFeedbackInfo() {
   Handle<TypeFeedbackInfo> info =
       Handle<TypeFeedbackInfo>::cast(NewStruct(TYPE_FEEDBACK_INFO_TYPE));
   info->initialize_storage();
-  info->set_feedback_vector(*empty_fixed_array(), SKIP_WRITE_BARRIER);
   return info;
 }
 
@@ -1814,15 +1813,32 @@ void Factory::BecomeJSFunction(Handle<JSReceiver> object) {
 }
 
 
+Handle<FixedArray> Factory::NewTypeFeedbackVector(int slot_count) {
+  // Ensure we can skip the write barrier
+  ASSERT_EQ(isolate()->heap()->uninitialized_symbol(),
+            *TypeFeedbackInfo::UninitializedSentinel(isolate()));
+
+  CALL_HEAP_FUNCTION(
+      isolate(),
+      isolate()->heap()->AllocateFixedArrayWithFiller(
+          slot_count,
+          TENURED,
+          *TypeFeedbackInfo::UninitializedSentinel(isolate())),
+      FixedArray);
+}
+
+
 Handle<SharedFunctionInfo> Factory::NewSharedFunctionInfo(
     Handle<String> name,
     int number_of_literals,
     bool is_generator,
     Handle<Code> code,
-    Handle<ScopeInfo> scope_info) {
+    Handle<ScopeInfo> scope_info,
+    Handle<FixedArray> feedback_vector) {
   Handle<SharedFunctionInfo> shared = NewSharedFunctionInfo(name);
   shared->set_code(*code);
   shared->set_scope_info(*scope_info);
+  shared->set_feedback_vector(*feedback_vector);
   int literals_array_size = number_of_literals;
   // If the function contains object, regexp or array literals,
   // allocate extra space for a literals array prefix containing the
@@ -1880,6 +1896,7 @@ Handle<SharedFunctionInfo> Factory::NewSharedFunctionInfo(Handle<String> name) {
   share->set_script(*undefined_value(), SKIP_WRITE_BARRIER);
   share->set_debug_info(*undefined_value(), SKIP_WRITE_BARRIER);
   share->set_inferred_name(*empty_string(), SKIP_WRITE_BARRIER);
+  share->set_feedback_vector(*empty_fixed_array(), SKIP_WRITE_BARRIER);
   share->set_initial_map(*undefined_value(), SKIP_WRITE_BARRIER);
   share->set_profiler_ticks(0);
   share->set_ast_node_count(0);