Implement in-heap backing store for typed arrays.

src/objects-visiting.h

Index: src/objects-visiting.h
diff --git a/src/objects-visiting.h b/src/objects-visiting.h
index f7758fdf4fcfed374698e35c8f68515e03c35cbb..967e1d4fc1a550e21af4d7b045ea2473689a98e0 100644
--- a/src/objects-visiting.h
+++ b/src/objects-visiting.h
@@ -47,13 +47,14 @@ namespace internal {
 class StaticVisitorBase : public AllStatic {
  public:
 #define VISITOR_ID_LIST(V)    \
-  V(SeqOneByteString)           \
+  V(SeqOneByteString)         \
   V(SeqTwoByteString)         \
   V(ShortcutCandidate)        \
   V(ByteArray)                \
   V(FreeSpace)                \
   V(FixedArray)               \
   V(FixedDoubleArray)         \
+  V(FixedTypedArray)          \
   V(ConstantPoolArray)        \
   V(NativeContext)            \
   V(AllocationSite)           \
@@ -322,6 +323,10 @@ class StaticNewSpaceVisitor : public StaticVisitorBase {
     return FixedDoubleArray::SizeFor(length);
   }
 
+  INLINE(static int VisitFixedTypedArray(Map* map, HeapObject* object)) {
+    return reinterpret_cast<FixedTypedArrayBase*>(object)->size();
+  }
+
   INLINE(static int VisitJSObject(Map* map, HeapObject* object)) {
     return JSObjectVisitor::Visit(map, object);
   }