go/types: use documented version of gotypesalias GODEBUG

[mateusz834]

This way the code would panic, in case it does not exist.

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[gopherbot]

Message from Mateusz Poliwczak:

Patch Set 1: Commit-Queue+1

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Message from Go LUCI:

Patch Set 1:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2024-12-14T11:04:25Z","revision":"4f99c5b01f87bdd1110bca5f0dd92c7c1e9a6e3b"}

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Message from Mateusz Poliwczak:

Patch Set 1: -Commit-Queue

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Message from Go LUCI:

Patch Set 1:

This CL has passed the run

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Message from Go LUCI:

Patch Set 1: LUCI-TryBot-Result+1

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Message from Robert Griesemer:

Patch Set 1:

(1 comment)

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Message from Alan Donovan:

Patch Set 1: Code-Review+2

(1 comment)

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Message from Cherry Mui:

Patch Set 1: Code-Review+1

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