Support array literals with FAST_DOUBLE_ELEMENTS ElementsKind.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 1a42811ad2f9ae73a66fc0f2a180959b07169d96..345100511a437917859aebb208f91045446ee6a8 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2185,6 +2185,9 @@ class FixedDoubleArray: public FixedArrayBase {
   // Checking for the hole.
   inline bool is_the_hole(int index);
 
+  // Copy operations
+  MUST_USE_RESULT inline MaybeObject* Copy();
+
   // Garbage collection support.
   inline static int SizeFor(int length) {
     return kHeaderSize + length * kDoubleSize;