cmd/internal/obj/wasm: use i64 for large return addr

[Zxilly]

Use i64 to avoid overflow when getting PC_F from the return addr.

Fixes #73246

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from Zxilly Chou:

Patch Set 2:

(1 comment)

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Message from Cherry Mui:

Patch Set 2: Code-Review+2 Commit-Queue+1

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Patch Set 2:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-04-09T06:38:31Z","revision":"d1e353ee2bf300fa6437f8fc27c8dbbd286cfc3b"}

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Patch Set 2: -Commit-Queue

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Patch Set 2:

This CL has passed the run

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Patch Set 2: LUCI-TryBot-Result+1

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Message from Zxilly Chou:

Patch Set 2:

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Message from Dmitri Shuralyov:

Patch Set 3: Code-Review+1

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This PR is being closed because golang.org/cl/663995 has been merged.