Use tagged union for getaddrinfo() #15655

Job	Run time
stubtest: stdlib (windows-latest, 3.14)	38s
stubtest: stdlib (ubuntu-latest, 3.15)	46s
stubtest: stdlib (windows-latest, 3.12)	40s
stubtest: stdlib (macos-latest, 3.14)	25s
stubtest: stdlib (ubuntu-latest, 3.10)	43s
stubtest: stdlib (windows-latest, 3.13)	38s
stubtest: stdlib (macos-latest, 3.15)	35s
stubtest: stdlib (macos-latest, 3.13)	20s
stubtest: stdlib (macos-latest, 3.10)	37s
stubtest: stdlib (ubuntu-latest, 3.14)	42s
stubtest: stdlib (windows-latest, 3.15)	39s
stubtest: stdlib (ubuntu-latest, 3.13)	44s
stubtest: stdlib (windows-latest, 3.11)	39s
stubtest: stdlib (macos-latest, 3.11)	48s
stubtest: stdlib (ubuntu-latest, 3.12)	37s
stubtest: stdlib (ubuntu-latest, 3.11)	38s
stubtest: stdlib (macos-latest, 3.12)	26s
	10m 35s

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