Merge in release25-maint r60793:
Added checks for integer overflows, contributed by Google. Some are
only available if asserts are left in the code, in cases where they
can't be triggered from Python code.
diff --git a/Misc/NEWS b/Misc/NEWS
index 4b9f21c..f721122 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -40,6 +40,11 @@
Exception (KeyboardInterrupt, and SystemExit) propagate instead of
ignoring them.
+- Added checks for integer overflows, contributed by Google. Some are
+ only available if asserts are left in the code, in cases where they
+ can't be triggered from Python code.
+
+
Extension Modules
-----------------