#3640: Correct a crash in cPickle on 64bit platforms, in the case of deeply nested lists or dicts.

Reviewed by Martin von Loewis.
diff --git a/Misc/NEWS b/Misc/NEWS
index fba4723..2fca41f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -75,6 +75,9 @@
 Library
 -------
 
+- Issue #3640: Pickling a list or a dict uses less local variables, to reduce
+  stack usage in the case of deeply nested objects.
+
 - Issue #3629: Fix sre "bytecode" validator for an end case.
 
 - Issue #3811: The Unicode database was updated to 5.1.