Dotty

Guard against recursive lower bounds in constraints #32437

Job	Run time
test_non_bootstrapped	0s
test	58m 49s
test_scala2_library_tasty	0s
test_windows_fast	46m 59s
test_windows_full	0s
MiMa	12m 8s
community_build_a	49m 57s
community_build_b	1h 32m 6s
community_build_c	54m 24s
test_sbt	18m 23s
build-msi-package	0s
test_java8	0s
build-sdk-package / build	8m 2s
build-chocolatey-package / build	20s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	5h 41m 8s

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