Use CopyElements for SetFastDoubleElementsCapacityAndLength

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 548dbcf48b0d6387c069bf6f29cf7eb6779abbb8..f0644a383ad3dd4bdc30085c45ef9fefddbd84ad 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2336,10 +2336,6 @@ class FixedArray: public FixedArrayBase {
 // FixedDoubleArray describes fixed-sized arrays with element type double.
 class FixedDoubleArray: public FixedArrayBase {
  public:
-  inline void Initialize(FixedArray* from);
-  inline void Initialize(FixedDoubleArray* from);
-  inline void Initialize(SeededNumberDictionary* from);
-
   // Setter and getter for elements.
   inline double get_scalar(int index);
   MUST_USE_RESULT inline MaybeObject* get(int index);