Make sure fixed typed array is always double aligned for doubles

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 801e98674a817a13d6e0e8592fd1a0e36699a85b..75ec7fe9e0b96ba9943260b30571b843c8a7e9dc 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4642,8 +4642,7 @@ class ExternalArray: public FixedArrayBase {
   // ExternalArray headers are not quadword aligned.
   static const int kExternalPointerOffset =
       POINTER_SIZE_ALIGN(FixedArrayBase::kLengthOffset + kPointerSize);
-  static const int kHeaderSize = kExternalPointerOffset + kPointerSize;
-  static const int kAlignedSize = OBJECT_POINTER_ALIGN(kHeaderSize);
+  static const int kSize = kExternalPointerOffset + kPointerSize;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ExternalArray);
@@ -4885,7 +4884,7 @@ class FixedTypedArrayBase: public FixedArrayBase {
  public:
   DECLARE_CAST(FixedTypedArrayBase)
 
-  static const int kDataOffset = kHeaderSize;
+  static const int kDataOffset = DOUBLE_POINTER_ALIGN(kHeaderSize);
 
   inline int size();
 
@@ -4914,14 +4913,6 @@ class FixedTypedArray: public FixedTypedArrayBase {
 
   DECLARE_CAST(FixedTypedArray<Traits>)
 
-  static inline int ElementOffset(int index) {
-    return kDataOffset + index * sizeof(ElementType);
-  }
-
-  static inline int SizeFor(int length) {
-    return ElementOffset(length);
-  }
-
   inline ElementType get_scalar(int index);
   static inline Handle<Object> get(Handle<FixedTypedArray> array, int index);
   inline void set(int index, ElementType value);