Dotty

Port scala/scala#10437 to scala2-library-cc #35994

Job	Run time
test	1h 4m 32s
test_windows_fast	54m 39s
test_sbt	16m 13s
MiMa	7m 39s
test_java8	0s
test_non_bootstrapped	-1s
community_build_a	47m 0s
community_build_b	1h 12m 25s
community_build_c	59m 21s
test_windows_full	0s
build-sdk-package / build	9m 52s
test_scala2_library_tasty	-1s
build-msi-package	0s
test-msi-package	0s
build-chocolatey-package / build	32s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	5h 32m 11s

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