Use tagged union for getaddrinfo() #15656

Job	Run time
stubtest: stdlib (ubuntu-latest, 3.11)	35s
stubtest: stdlib (ubuntu-latest, 3.10)	43s
stubtest: stdlib (macos-latest, 3.10)	50s
stubtest: stdlib (ubuntu-latest, 3.14)	42s
stubtest: stdlib (ubuntu-latest, 3.12)	40s
stubtest: stdlib (windows-latest, 3.12)	1m 19s
stubtest: stdlib (ubuntu-latest, 3.15)	43s
stubtest: stdlib (windows-latest, 3.13)	1m 23s
stubtest: stdlib (windows-latest, 3.11)	1m 21s
stubtest: stdlib (windows-latest, 3.15)	1m 49s
stubtest: stdlib (ubuntu-latest, 3.13)	41s
stubtest: stdlib (macos-latest, 3.13)	32s
stubtest: stdlib (windows-latest, 3.14)	1m 4s
stubtest: stdlib (macos-latest, 3.15)	44s
stubtest: stdlib (macos-latest, 3.11)	44s
stubtest: stdlib (macos-latest, 3.14)	27s
stubtest: stdlib (macos-latest, 3.12)	25s
	14m 42s

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