Issue #29034: Merge 3.6.

diff --cc Misc/NEWS
index dc72a1f2477d4ddf146141acdc02aba4513171e7,973b0209aad25171ed5b164f3996654ffbe4735c..82e8e965f7bc2c46038f29101215f72de516085f
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -10,14 -10,10 +10,16 @@@ What's New in Python 3.7.0 alpha 1
  Core and Builtins
  -----------------
  
+ - Issue #29034: Fix memory leak and use-after-free in os module (path_converter).
+ 
  - Issue #29159: Fix regression in bytes(x) when x.__index__() raises Exception.
  
 +- Issue #29049: Call _PyObject_GC_TRACK() lazily when calling Python function.
 +  Calling function is up to 5% faster.
 +
 +- Issue #28927: bytes.fromhex() and bytearray.fromhex() now ignore all ASCII
 +  whitespace, not only spaces.  Patch by Robert Xiao.
 +
  - Issue #28932: Do not include <sys/random.h> if it does not exist.
  
  - Issue #25677: Correct the positioning of the syntax error caret for

diff --cc Modules/posixmodule.c
Simple merge