encoding/gob: extend partially allocated string slices

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Fixes #59172

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Patch Set 1:

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Message from Ian Lance Taylor:

Patch Set 1:

(4 comments)

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This PR (HEAD: d1a9866) has been imported to Gerrit for code review.

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Message from Johan Abildskov:

Patch Set 2:

(4 comments)

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Message from Ian Lance Taylor:

Patch Set 2: Run-TryBot+1

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Message from Gopher Robot:

Patch Set 2:

(1 comment)

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Message from Gopher Robot:

Patch Set 2: TryBot-Result+1

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Message from Ian Lance Taylor:

Patch Set 2: Auto-Submit+1 Code-Review+2 Run-TryBot+1

(1 comment)

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Message from Rob Pike:

Patch Set 2: Code-Review+2

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This PR is being closed because golang.org/cl/478215 has been merged.