Dotty

Remove special overriding logic for explicit nulls #33928

Job	Run time
test	56m 40s
test_non_bootstrapped	0s
test_scala2_library_tasty	0s
test_windows_fast	32m 2s
community_build_a	56m 5s
MiMa	10m 38s
test_windows_full	0s
community_build_b	1h 32m 20s
community_build_c	1h 0m 26s
test_sbt	18m 18s
build-msi-package	0s
test_java8	0s
build-sdk-package / build	7m 47s
test-msi-package	0s
build-chocolatey-package / build	25s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	5h 34m 41s

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