v8 typed arrays: add DataView type

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 3dd3fd678aaa284ae78025c05e872fa3df5dac89..4219b79a2507b39c540f6da102f4333850afabbe 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -682,6 +682,7 @@ bool Object::IsBoolean() {
 
 TYPE_CHECKER(JSArray, JS_ARRAY_TYPE)
 TYPE_CHECKER(JSArrayBuffer, JS_ARRAY_BUFFER_TYPE)
+TYPE_CHECKER(JSDataView, JS_DATA_VIEW_TYPE)
 TYPE_CHECKER(JSTypedArray, JS_TYPED_ARRAY_TYPE)
 TYPE_CHECKER(JSRegExp, JS_REGEXP_TYPE)
 
@@ -1644,6 +1645,8 @@ int JSObject::GetHeaderSize() {
       return JSArray::kSize;
     case JS_ARRAY_BUFFER_TYPE:
       return JSArrayBuffer::kSize;
+    case JS_DATA_VIEW_TYPE:
+      return JSDataView::kSize;
     case JS_TYPED_ARRAY_TYPE:
       return JSTypedArray::kSize;
     case JS_SET_TYPE:
@@ -2548,6 +2551,7 @@ CAST_ACCESSOR(JSBuiltinsObject)
 CAST_ACCESSOR(Code)
 CAST_ACCESSOR(JSArray)
 CAST_ACCESSOR(JSArrayBuffer)
+CAST_ACCESSOR(JSDataView)
 CAST_ACCESSOR(JSTypedArray)
 CAST_ACCESSOR(JSRegExp)
 CAST_ACCESSOR(JSProxy)
@@ -5333,6 +5337,11 @@ void JSArrayBuffer::set_is_external(bool value) {
 }
 
 
+ACCESSORS(JSDataView, buffer, Object, kBufferOffset)
+ACCESSORS(JSDataView, byte_offset, Object, kByteOffsetOffset)
+ACCESSORS(JSDataView, byte_length, Object, kByteLengthOffset)
+
+
 ACCESSORS(JSTypedArray, buffer, Object, kBufferOffset)
 ACCESSORS(JSTypedArray, byte_offset, Object, kByteOffsetOffset)
 ACCESSORS(JSTypedArray, byte_length, Object, kByteLengthOffset)