Dotty

Limit exposure to ConcurrentModificationException when sys props are … #33685

Job	Run time
test_non_bootstrapped	27m 27s
test_scala2_library_tasty	0s
test	54m 49s
test_windows_fast	0s
test_windows_full	46m 18s
community_build_b	1h 32m 55s
community_build_a	52m 33s
community_build_c	1h 3m 30s
MiMa	10m 53s
build-msi-package	0s
test_java8	0s
test_sbt	20m 15s
build-sdk-package / build	7m 40s
test-msi-package	0s
build-chocolatey-package / build	23s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	6h 16m 43s

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