Simplify feedback vector creation and store in SharedFunctionInfo.

src/full-codegen.cc

Index: src/full-codegen.cc
diff --git a/src/full-codegen.cc b/src/full-codegen.cc
index db6da902c7868ee7d1b5a929d30e6d49512ee2c7..d489568ae08de6270fa62fb7da5bb1e8fcbed383 100644
--- a/src/full-codegen.cc
+++ b/src/full-codegen.cc
@@ -384,14 +384,10 @@ unsigned FullCodeGenerator::EmitBackEdgeTable() {
 }
 
 
-void FullCodeGenerator::InitializeFeedbackVector() {
-  int length = info_->function()->slot_count();
-  feedback_vector_ = isolate()->factory()->NewFixedArray(length, TENURED);
-  Handle<Object> sentinel = TypeFeedbackInfo::UninitializedSentinel(isolate());
-  // Ensure that it's safe to set without using a write barrier.
-  ASSERT_EQ(isolate()->heap()->uninitialized_symbol(), *sentinel);
-  for (int i = 0; i < length; i++) {
-    feedback_vector_->set(i, *sentinel, SKIP_WRITE_BARRIER);
+void FullCodeGenerator::EnsureSlotContainsAllocationSite(int slot) {
+  Handle<FixedArray> vector = FeedbackVector();
+  if (!vector->get(slot)->IsAllocationSite()) {
+    vector->set(slot, *isolate()->factory()->NewAllocationSite());
   }
 }
 
@@ -414,7 +410,6 @@ void FullCodeGenerator::PopulateDeoptimizationData(Handle<Code> code) {
 void FullCodeGenerator::PopulateTypeFeedbackInfo(Handle<Code> code) {
   Handle<TypeFeedbackInfo> info = isolate()->factory()->NewTypeFeedbackInfo();
   info->set_ic_total_count(ic_total_count_);
-  info->set_feedback_vector(*FeedbackVector());
   ASSERT(!isolate()->heap()->InNewSpace(*info));
   code->set_type_feedback_info(*info);
 }
@@ -1577,8 +1572,10 @@ void FullCodeGenerator::VisitNativeFunctionLiteral(
   Handle<Code> construct_stub = Handle<Code>(fun->shared()->construct_stub());
   bool is_generator = false;
   Handle<SharedFunctionInfo> shared =
-      isolate()->factory()->NewSharedFunctionInfo(name, literals, is_generator,
-          code, Handle<ScopeInfo>(fun->shared()->scope_info()));
+      isolate()->factory()->NewSharedFunctionInfo(
+          name, literals, is_generator,
+          code, Handle<ScopeInfo>(fun->shared()->scope_info()),
+          Handle<FixedArray>(fun->shared()->feedback_vector()));
   shared->set_construct_stub(*construct_stub);
 
   // Copy the function data to the shared function info.