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 a87af1df064a159e5f4d595a0a1f4c6d6c045560..1abbe118a5305e61b4978c3a554758b4b4576f56 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -290,6 +290,10 @@ 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);