Always interpret underscores inside patterns as type bounds (#21718) #32726

Job	Run time
test	55m 31s
test_non_bootstrapped	28m 15s
test_windows_full	59m 13s
community_build_a	56m 34s
MiMa	12m 35s
community_build_b	1h 28m 45s
test_windows_fast	0s
community_build_c	1h 4m 31s
test_java8	0s
test_sbt	18m 41s
test_scala2_library_tasty	0s
build-msi-package	0s
build-sdk-package / build	7m 53s
build-chocolatey-package / build	15s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	6h 32m 13s

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