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Just manually verified that PR19377, when compiled against xlc - crashes during make:
	rm -f libpython3.9d.a
	ar rcs libpython3.9d.a Modules/getbuildinfo.o Parser/acceler.o Parser/grammar1.o Parser/listnode.o Parser/node.o Parser/parser.o Parser/token.o Parser/myreadline.o Parser/parsetok.o Parser/tokenizer.o Objects/abstract.o Objects/accu.o Objects/boolobject.o Objects/bytes_methods.o Objects/bytearrayobject.o Objects/bytesobject.o Objects/call.o Objects/capsule.o Objects/cellobject.o Objects/classobject.o Objects/codeobject.o Objects/complexobject.o Objects/descrobject.o Objects/enumobject.o Objects/exceptions.o Objects/genobject.o Objects/fileobject.o Objects/floatobject.o Objects/frameobject.o Objects/funcobject.o Objects/interpreteridobject.o Objects/iterobject.o Objects/listobject.o Objects/longobject.o Objects/dictobject.o Objects/odictobject.o Objects/memoryobject.o Objects/methodobject.o Objects/moduleobject.o Objects/namespaceobject.o Objects/object.o Objects/obmalloc.o Objects/picklebufobject.o Objects/rangeobject.o Objects/setobject.o Objects/sliceobject.o Objects/structseq.o Objects/tupleobject.o Objects/typeobject.o Objects/unicodeobject.o Objects/unicodectype.o Objects/weakrefobject.o Python/_warnings.o Python/Python-ast.o Python/asdl.o Python/ast.o Python/ast_opt.o Python/ast_unparse.o Python/bltinmodule.o Python/ceval.o Python/codecs.o Python/compile.o Python/context.o Python/dynamic_annotations.o Python/errors.o Python/frozenmain.o Python/future.o Python/getargs.o Python/getcompiler.o Python/getcopyright.o Python/getplatform.o Python/getversion.o Python/graminit.o Python/hamt.o Python/import.o Python/importdl.o Python/initconfig.o Python/marshal.o Python/modsupport.o Python/mysnprintf.o Python/mystrtoul.o Python/pathconfig.o Python/peephole.o Python/preconfig.o Python/pyarena.o Python/pyctype.o Python/pyfpe.o Python/pyhash.o Python/pylifecycle.o Python/pymath.o Python/pystate.o Python/pythonrun.o Python/pytime.o Python/bootstrap_hash.o Python/structmember.o Python/symtable.o Python/sysmodule.o Python/thread.o Python/traceback.o Python/getopt.o Python/pystrcmp.o Python/pystrtod.o Python/pystrhex.o Python/dtoa.o Python/formatter_unicode.o Python/fileutils.o Python/dynload_shlib.o Modules/config.o Modules/getpath.o Modules/main.o Modules/gcmodule.o Modules/posixmodule.o Modules/errnomodule.o Modules/pwdmodule.o Modules/_sre.o Modules/_codecsmodule.o Modules/_weakref.o Modules/_functoolsmodule.o Modules/_operator.o Modules/_collectionsmodule.o Modules/_abc.o Modules/itertoolsmodule.o Modules/atexitmodule.o Modules/signalmodule.o Modules/_stat.o Modules/timemodule.o Modules/_threadmodule.o Modules/_localemodule.o Modules/_iomodule.o Modules/iobase.o Modules/fileio.o Modules/bytesio.o Modules/bufferedio.o Modules/textio.o Modules/stringio.o Modules/faulthandler.o Modules/_tracemalloc.o Modules/hashtable.o Modules/symtablemodule.o Modules/xxsubtype.o Python/frozen.o
	./Modules/makexp_aix Modules/python.exp . libpython3.9d.a; xlc_r -Wl,-bE:Modules/python.exp -lld -o python Programs/python.o libpython3.9d.a -lintl -ldl -lm -lm 
	 ./python -E -S -m sysconfig --generate-posix-vars ; if test $? -ne 0 ; then echo "generate-posix-vars failed" ; rm -f ./pybuilddir.txt ; exit 1 ; fi
Objects/genobject.c:127: _PyObject_GC_TRACK: Assertion "!(((PyGC_Head *)(op)-1)->_gc_next != 0)" failed: object already tracked by the garbage collector
Enable tracemalloc to get the memory block allocation traceback
object address : 30084150
object refcount : 0
object type : 20013aa8
object type name: generator
object repr : <refcnt 0 at 30084150>
Fatal Python error: _PyObject_AssertFailed: _PyObject_AssertFailed
Python runtime state: core initialized
Current thread 0x00000001 (most recent call first):
 File "<frozen importlib._bootstrap_external>", line 1593 in _setup
 File "<frozen importlib._bootstrap_external>", line 1634 in _install
 File "<frozen importlib._bootstrap>", line 1189 in _install_external_importers
/bin/sh: 24117648 IOT/Abort trap(coredump)
make: 1254-004 The error code from the last command is 134.
Stop.
FYI: about two hours ago I verified that xlc and 08050e959e6c40839cd2c9e5f6a4fd1513e3d605 : bpo-40147: Fix a compiler warning on Windows in Python/compile.c (GH-19389)
all was green.