Drop inaccessible subclasses from refineUsingParent (#21799) #33078

Job	Run time
test_non_bootstrapped	24m 5s
test	33m 12s
test_scala2_library_tasty	0s
test_windows_fast	0s
MiMa	12m 16s
test_windows_full	59m 50s
community_build_a	54m 9s
community_build_b	1h 27m 33s
community_build_c	1h 5m 29s
test_sbt	17m 56s
build-msi-package	0s
test_java8	0s
build-sdk-package / build	7m 47s
test-msi-package	0s
build-chocolatey-package / build	18s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	6h 2m 35s

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