Simplify feedback vector creation and store in SharedFunctionInfo.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 5d96c2fbfc914be07b180f6def5ef916d9b39c3d..e5152e8035f071f0a08800fed1c642dde66a4d0f 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -5733,8 +5733,6 @@ class Code: public HeapObject {
   void ClearInlineCaches();
   void ClearInlineCaches(Kind kind);
 
-  void ClearTypeFeedbackInfo(Heap* heap);
-
   BailoutId TranslatePcOffsetToAstId(uint32_t pc_offset);
   uint32_t TranslateAstIdToPcOffset(BailoutId ast_id);
 
@@ -6998,6 +6996,8 @@ class SharedFunctionInfo: public HeapObject {
   // Removed a specific optimized code object from the optimized code map.
   void EvictFromOptimizedCodeMap(Code* optimized_code, const char* reason);
 
+  void ClearTypeFeedbackInfo();
+
   // Trims the optimized code map after entries have been removed.
   void TrimOptimizedCodeMap(int shrink_by);
 
@@ -7102,6 +7102,12 @@ class SharedFunctionInfo: public HeapObject {
   inline int construction_count();
   inline void set_construction_count(int value);
 
+  // [feedback_vector] - accumulates ast node feedback from full-codegen and
+  // (increasingly) from crankshafted code where sufficient feedback isn't
+  // available. Currently the field is duplicated in
+  // TypeFeedbackInfo::feedback_vector, but the allocation is done here.
+  DECL_ACCESSORS(feedback_vector, FixedArray)
+
   // [initial_map]: initial map of the first function called as a constructor.
   // Saved for the duration of the tracking phase.
   // This is a weak link (GC resets it to undefined_value if no other live
@@ -7383,8 +7389,10 @@ class SharedFunctionInfo: public HeapObject {
   static const int kScriptOffset = kFunctionDataOffset + kPointerSize;
   static const int kDebugInfoOffset = kScriptOffset + kPointerSize;
   static const int kInferredNameOffset = kDebugInfoOffset + kPointerSize;
-  static const int kInitialMapOffset =
+  static const int kFeedbackVectorOffset =
       kInferredNameOffset + kPointerSize;
+  static const int kInitialMapOffset =
+      kFeedbackVectorOffset + kPointerSize;
 #if V8_HOST_ARCH_32_BIT
   // Smi fields.
   static const int kLengthOffset =
@@ -8464,7 +8472,6 @@ class TypeFeedbackInfo: public Struct {
   inline void set_inlined_type_change_checksum(int checksum);
   inline bool matches_inlined_type_change_checksum(int checksum);
 
-  DECL_ACCESSORS(feedback_vector, FixedArray)
 
   static inline TypeFeedbackInfo* cast(Object* obj);
 
@@ -8474,10 +8481,9 @@ class TypeFeedbackInfo: public Struct {
 
   static const int kStorage1Offset = HeapObject::kHeaderSize;
   static const int kStorage2Offset = kStorage1Offset + kPointerSize;
-  static const int kFeedbackVectorOffset =
-      kStorage2Offset + kPointerSize;
-  static const int kSize = kFeedbackVectorOffset + kPointerSize;
+  static const int kSize = kStorage2Offset + kPointerSize;
 
+  // TODO(mvstanton): move these sentinel declarations to shared function info.
   // The object that indicates an uninitialized cache.
   static inline Handle<Object> UninitializedSentinel(Isolate* isolate);
 
@@ -8493,9 +8499,6 @@ class TypeFeedbackInfo: public Struct {
   // garbage collection (e.g., for patching the cache).
   static inline Object* RawUninitializedSentinel(Heap* heap);
 
-  static const int kForInFastCaseMarker = 0;
-  static const int kForInSlowCaseMarker = 1;
-
  private:
   static const int kTypeChangeChecksumBits = 7;