Dotty

Fix treatment of separately compiled @native methods in FirstTransform #32454

Job	Run time
test	41m 30s
test_non_bootstrapped	0s
test_windows_fast	42m 59s
community_build_a	53m 33s
community_build_b	1h 25m 35s
MiMa	11m 51s
test_scala2_library_tasty	0s
test_windows_full	0s
community_build_c	1h 8m 1s
test_sbt	20m 18s
build-msi-package	0s
test_java8	0s
build-sdk-package / build	8m 19s
build-chocolatey-package / build	21s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	5h 32m 27s

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