Issue #28583: PyDict_SetDefault didn't combine split table when needed.

Patch by Xiang Zhang.

diff --cc Misc/NEWS
index ebbe0c2f402f775bf7d937d874f555b497f52cc6,1e939f5b99399c50275ae1d918161d07a725bd56..a58b2089604d0b77172a0117496a1e7ba19e276c
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -10,6 -10,21 +10,9 @@@ What's New in Python 3.7.0 alpha 
  Core and Builtins
  -----------------
  
 -Library
 --------
 -
 -
 -What's New in Python 3.6.0 beta 3
 -=================================
 -
 -*Release date: 2016-10-31*
 -
 -Core and Builtins
 ------------------
 -
+ - Issue #28583: PyDict_SetDefault didn't combine split table when needed.
+   Patch by Xiang Zhang.
+ 
  - Issue #28128: Deprecation warning for invalid str and byte escape
    sequences now prints better information about where the error
    occurs. Patch by Serhiy Storchaka and Eric Smith.

diff --cc Objects/dictobject.c
Simple merge