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 :-)