Dotty

chore: optimize lazy val with power of two. #36029

Job	Run time
community_build_a	55m 30s
test	1h 6m 0s
community_build_b	1h 16m 40s
test_windows_fast	41m 53s
MiMa	11m 14s
test_scala2_library_tasty	0s
community_build_c	1h 3m 39s
test_sbt	17m 38s
test_non_bootstrapped	0s
build-msi-package	0s
build-sdk-package / build	9m 9s
test_windows_full	0s
test_java8	0s
test-msi-package	0s
build-chocolatey-package / build	21s
test-chocolatey-package	-1s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	5h 42m 3s

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