Pretenure code generation corner case with new space COW arrays.

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index 86c26044c0b78451ec5527d19a6e3c9a03a4619b..7fed9e8837bb60796a69499facdf30ae4b4d63ba 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -289,6 +289,10 @@ class Factory {
 
   Handle<FixedArray> CopyFixedArray(Handle<FixedArray> array);
 
+  // This method expects a COW array in new space, and creates a copy
+  // of it in old space.
+  Handle<FixedArray> CopyAndTenureFixedCOWArray(Handle<FixedArray> array);
+
   Handle<FixedArray> CopySizeFixedArray(Handle<FixedArray> array,
                                         int new_length,
                                         PretenureFlag pretenure = NOT_TENURED);