Dotty

Fix inline reduction for CaseDef guards with asInstanceOf #33770

Job	Run time
test_non_bootstrapped	0s
test	25m 36s
test_windows_fast	25m 39s
community_build_a	25m 41s
community_build_b	25m 40s
MiMa	13m 25s
test_scala2_library_tasty	0s
test_windows_full	0s
build-msi-package	0s
community_build_c	25m 41s
test_java8	0s
test_sbt	21m 19s
build-sdk-package / build	7m 47s
test-msi-package	0s
build-chocolatey-package / build	17s
test-chocolatey-package	0s
publish_nightly	1s
publish_release	1s
nightly_documentation	1s
open_issue_on_failure	1s
	2h 51m 9s

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