internal/poll: avoid memory leak in Writev

[taoyuanyuan]

The chunks that were referenced by fd.iovecs would not be GC.

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Message from Gobot Gobot:

Patch Set 1:

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This PR (HEAD: 3972193) has been imported to Gerrit for code review.

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Message from Brad Fitzpatrick:

Patch Set 2:

(1 comment)

R=iant

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This PR (HEAD: e0b7f68) has been imported to Gerrit for code review.

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Message from Yang Tian:

Patch Set 3:

Patch Set 2:

(1 comment)

R=iant

Uploaded patch

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Message from Ian Lance Taylor:

Patch Set 3: Run-TryBot+1

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Message from Gobot Gobot:

Patch Set 3:

TryBots beginning. Status page: https://farmer.golang.org/try?commit=025d40ed

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Message from Gobot Gobot:

Patch Set 3: TryBot-Result+1

TryBots are happy.

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Message from Ian Lance Taylor:

Patch Set 3: Code-Review+2

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This PR is being closed because golang.org/cl/178037 has been merged.