Dotty

Implement SIP-61 `@unroll` annotation #33693

Job	Run time
test_non_bootstrapped	0s
test	55m 19s
test_scala2_library_tasty	0s
test_windows_fast	43m 56s
MiMa	10m 39s
test_windows_full	0s
community_build_a	55m 1s
community_build_b	1h 23m 33s
community_build_c	58m 41s
test_sbt	21m 51s
build-msi-package	0s
test_java8	0s
build-sdk-package / build	7m 49s
test-msi-package	0s
build-chocolatey-package / build	31s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	5h 37m 20s

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