bpo-39573: Update clinic to use Py_IS_TYPE macro

[corona10]

https://bugs.python.org/issue39573

[codecov]

Codecov Report

Merging #18507 into master will increase coverage by 2.65%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master   #18507       +/-   ##
===========================================
+ Coverage   79.46%   82.12%    +2.65%     
===========================================
  Files         384     1955     +1571     
  Lines      169290   583979   +414689     
  Branches        0    44450    +44450     
===========================================
+ Hits       134529   479572   +345043     
- Misses      34761    94765    +60004     
- Partials        0     9642     +9642     

Impacted Files	Coverage Δ
Programs/_testembed.c	89.43% <0.00%> (-0.13%)	⬇️
Lib/test/test_reprlib.py	95.75% <0.00%> (ø)
Lib/modulefinder.py	67.44% <0.00%> (ø)
Lib/distutils/tests/support.py	85.00% <0.00%> (ø)
Lib/email/mime/base.py	100.00% <0.00%> (ø)
Lib/tkinter/test/test_ttk/test_widgets.py	97.43% <0.00%> (ø)
Lib/importlib/abc.py	93.44% <0.00%> (ø)
Lib/test/test_property.py	90.32% <0.00%> (ø)
Lib/test/test_importlib/test_open.py	95.23% <0.00%> (ø)
Lib/unittest/test/testmock/support.py	87.50% <0.00%> (ø)
... and 1564 more

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[vstinner]

Merged, thanks. I just replace "macro" with "function" in the commit message :-)