Support array literals with FAST_DOUBLE_ELEMENTS ElementsKind.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index c6fa55435653808ea690e5b8918aeaf25240239a..bce74170b1613e0688d23c48ffea57216893cad8 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -4568,6 +4568,12 @@ MaybeObject* FixedArray::Copy() {
 }
 
 
+MaybeObject* FixedDoubleArray::Copy() {
+  if (length() == 0) return this;
+  return GetHeap()->CopyFixedDoubleArray(this);
+}
+
+
 Relocatable::Relocatable(Isolate* isolate) {
   ASSERT(isolate == Isolate::Current());
   isolate_ = isolate;