Store offset between fixed typed array base and data start in object

src/elements-kind.cc

Index: src/elements-kind.cc
diff --git a/src/elements-kind.cc b/src/elements-kind.cc
index 758b80ddbdeaaf3a86af3d5d632fbf50bb6cefca..07d2837bdc86ca747d1e4468887f6bfa6b049dfd 100644
--- a/src/elements-kind.cc
+++ b/src/elements-kind.cc
@@ -53,13 +53,17 @@ int ElementsKindToShiftSize(ElementsKind elements_kind) {
 }
 
 
+static bool IsTypedArrayElementsKind(ElementsKind elements_kind) {
+  return IsFixedTypedArrayElementsKind(elements_kind) ||
+         IsExternalArrayElementsKind(elements_kind);
+}
+
+
 int GetDefaultHeaderSizeForElementsKind(ElementsKind elements_kind) {
   STATIC_ASSERT(FixedArray::kHeaderSize == FixedDoubleArray::kHeaderSize);
 
-  if (IsExternalArrayElementsKind(elements_kind)) {
+  if (IsTypedArrayElementsKind(elements_kind)) {
     return 0;
-  } else if (IsFixedTypedArrayElementsKind(elements_kind)) {
-    return FixedTypedArrayBase::kDataOffset - kHeapObjectTag;
   } else {
     return FixedArray::kHeaderSize - kHeapObjectTag;
   }
@@ -135,12 +139,6 @@ ElementsKind GetNextTransitionElementsKind(ElementsKind kind) {
 }
 
 
-static bool IsTypedArrayElementsKind(ElementsKind elements_kind) {
-  return IsFixedTypedArrayElementsKind(elements_kind) ||
-      IsExternalArrayElementsKind(elements_kind);
-}
-
-
 static inline bool IsFastTransitionTarget(ElementsKind elements_kind) {
   return IsFastElementsKind(elements_kind) ||
       elements_kind == DICTIONARY_ELEMENTS;