Issue #20440: Massive replacing unsafe attribute setting code with special

macro Py_SETREF.

diff --cc Misc/NEWS
Simple merge

diff --cc Modules/_ctypes/_ctypes.c
Simple merge

diff --cc Modules/_sre.c
Simple merge

diff --cc Modules/itertoolsmodule.c
Simple merge

diff --cc Objects/bytesobject.c
Simple merge

diff --cc Objects/typeobject.c
Simple merge

diff --cc Objects/unicodeobject.c
Simple merge

diff --cc Parser/tokenizer.c
Simple merge

diff --cc Python/ceval.c
Simple merge

diff --cc Python/compile.c
Simple merge