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Use `link[T]` in place of `*Node` in syntax nodes. #38214

Job	Run time
extension	27s
smoke	3m 8s
release-build	7m 59s
test extra (windows-latest)	7m 20s
build	2m 3s
go-test	4m 51s
package-feed-proxy	40s
generate	2m 45s
codegen	5m 23s
test (concurrent test programs)	10m 14s
lint (noembed)	4m 59s
lint (ubuntu-latest)	4m 57s
lint (windows-latest)	8m 35s
test extra (ubuntu-latest)	5m 21s
test (linux arm64)	6m 29s
tidy	55s
test (race mode)	16m 23s
test (windows arm64)	13m 44s
test (noembed)	3m 28s
format	53s
test (windows-latest)	12m 9s
test (ubuntu-latest)	9m 22s
misc	52s
required	3s
	2h 13m 0s