_PyObject_DebugReallocApi() now calls Py_FatalError() if realloc()
fails to shrink a memory block.

Call Py_FatalError() because _PyObject_DebugReallocApi() erased freed
bytes *before* realloc(), expecting that realloc() *cannot* fail to
shrink a memory block.

* bpo-31324: Optimize support._match_test() (#4421)

* Rename support._match_test() to support.match_test(): make it
  public
* Remove support.match_tests global variable. It is replaced with a
  new support.set_match_tests() function, so match_test() doesn't
  have to check each time if patterns were modified.
* Rewrite match_test(): use different code paths depending on the
  kind of patterns for best performances.
Co-Authored-By: Serhiy Storchaka <storchaka@gmail.com>
(cherry picked from commit 803ddd8c)

* bpo-31324: Fix test.support.set_match_tests(None) (#4505)

(cherry picked from commit bb11c3c9)
(cherry picked from commit 70b2f8797146a56a6880743424f0bedf4fc30c62)

Fix the following warning:

Warning -- files was modified by test_builtin
  Before: []
  After:  ['@test_19422_tmp']
1 test altered the execution environment:
    test_builtin

Replace python3 with python2.

The line number in correct when using the -x option: Py_Main() uses
ungetc() to not skip the first newline character.

(cherry picked from commit 7750bded)

`kargs` -> `kwargs`

(cherry picked from commit b0b44b4b)

* Work around a GC process finalization bug.

The logging RLock instances may exist but the threading.RLock class
itself has already been emptied causing a
Exception TypeError: "'NoneType' object is not callable" in <function _removeHandlerRef ..."
to be printed to stderr on process termination.

This catches that exception and ignores it because there is absolutely
nothing we can or should do about it from the context of a weakref
handler called from the gc context.

[2.7] bpo-31927: Fix reading arbitrary data when parse a AF_BLUETOOTH address (GH-4235) (GH-4352) (#4355)

on NetBSD and DragonFly BSD.
(cherry picked from commit d3187158).
(cherry picked from commit 596286f8f3c8e53ef010d6298464775dc900a515)

select.kevent objects are now comparable with other objects in Python 2.

Define __hash__() in test_functools and test_itertools to fix the
following warning:

DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x

(cherry picked from commit 0de92859)

Fix CCompiler.set_executable() of distutils to handle properly Unicode strings.

bpo-31764: Prevent a crash in sqlite3.Cursor.close() in case the Cursor object is uninitialized (GH-4333)

(cherry picked from commit 5a66c8a6)

(cherry picked from commit cb04f751)

bpo-31770: Prevent a crash and refleaks when calling sqlite3.Cursor.__init__() more than once (GH-3968) (#4302)

(cherry picked from commit e56ab746)

(cherry picked from commit aafece7a)

(cherry picked from commit b838cc3f)

* Using ifconfig on NetBSD and OpenBSD.
* Using arp on Linux, FreeBSD, NetBSD and OpenBSD.

Based on patch by Takayuki Shimizukawa..
(cherry picked from commit ee1a9a2b)

(cherry picked from commit a7723d8b)

Bug report and patch by Jeroen Demeyer..
(cherry picked from commit f6f90ff0)

(cherry picked from commit 4f469c09)

(cherry picked from commit 894ebd06)

bpo-31910: test_create_connection() now catchs also EADDRNOTAVAIL to
fix the test on Travis CI.
(cherry picked from commit 280c22a8)

Modify the code to use ncurses is_pad() instead of checking WINDOW
_flags field.  If your platform does not provide the is_pad(), the
existing way that checks the field will be enabled.

Note: This change does not drop support for platforms where do not
have both WINDOW _flags field and is_pad().
(cherry picked from commit 8bc7d635)

* Fix a compilation error on FreeBSD.
* Fix the data attribute size on Mac OS X.
(cherry picked from commit 2298fad5)

Document the following functions:

* PyObject_Malloc()
* PyObject_Realloc()
* PyObject_Free()

Document also the pymalloc allocator.

* Fixed the layout of the kqueue_event structure on OpenBSD and NetBSD.
* Fixed the comparison of the kqueue_event objects..
(cherry picked from commit b9052a0f)

(cherry picked from commit baac01e6)

test_curses now saves/restores signals. On FreeBSD, the curses module
sets handlers of some signals, but don't restore old handlers when
the module is deinitialized.

(cherry picked from commit 19f68301)

separators that are not bytes-like objects..
(cherry picked from commit a2314283)

GCC says:
../cpython/Python/marshal.c: In function ‘PyMarshal_WriteLongToFile’:
../cpython/Python/marshal.c:70:35: warning: ‘wf.ptr’ may be used uninitialized in this function [-Wmaybe-uninitialized]
                       else if ((p)->ptr != (p)->end) *(p)->ptr++ = (c); \
                                   ^~
../cpython/Python/marshal.c:70:47: warning: ‘wf.end’ may be used uninitialized in this function [-Wmaybe-uninitialized]
                       else if ((p)->ptr != (p)->end) *(p)->ptr++ = (c); \
                                               ^~
../cpython/Python/marshal.c:77:10: warning: ‘wf.str’ may be used uninitialized in this function [-Wmaybe-uninitialized]
     if (p->str == NULL)
         ~^~~~~

This isn't a real problem because if the file pointer is not NULL, the
string-related fields are never touched. But, it doesn't hurt to set the unused
fields to NULL.