Support array literals with FAST_DOUBLE_ELEMENTS ElementsKind.

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index a3615f2a0a203e975a4ad26f0209d8600f6bcdda..97275ee42b10278aa39f1e2fb97641097e4baa83 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -50,7 +50,7 @@ class Factory {
       PretenureFlag pretenure = NOT_TENURED);
 
   // Allocate a new uninitialized fixed double array.
-  Handle<FixedArray> NewFixedDoubleArray(
+  Handle<FixedDoubleArray> NewFixedDoubleArray(
       int size,
       PretenureFlag pretenure = NOT_TENURED);
 
@@ -222,6 +222,9 @@ class Factory {
 
   Handle<FixedArray> CopyFixedArray(Handle<FixedArray> array);
 
+  Handle<FixedDoubleArray> CopyFixedDoubleArray(
+      Handle<FixedDoubleArray> array);
+
   // Numbers (eg, literals) are pretenured by the parser.
   Handle<Object> NewNumber(double value,
                            PretenureFlag pretenure = NOT_TENURED);