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Memoize repeated inference walks #39093

Job	Run time
extension	23s
build	3m 28s
generate	5m 13s
release-build	13m 0s
tidy	1m 8s
codegen	9m 35s
package-feed-proxy	39s
test extra (ubuntu-latest)	8m 22s
test extra (windows-latest)	7m 40s
lint (ubuntu-latest)	8m 59s
format	1m 4s
test (race mode)	20m 0s
lint (windows-latest)	10m 42s
misc	50s
test (windows-latest)	18m 40s
test (linux arm64)	9m 56s
test (noembed)	5m 26s
test (windows arm64)	18m 50s
test (ubuntu-latest)	8m 36s
go-test	6m 37s
smoke	4m 47s
lint (noembed)	8m 48s
test (concurrent test programs)	14m 21s
required	4s
	3h 7m 8s