runtime: fix buffer overflow in make(chan) On 32-bits one can arrange make(chan) params so that the chan buffer gives you access to whole memory.
runtime: fix buffer overflow in make(chan)
On 32-bits one can arrange make(chan) params so that
the chan buffer gives you access to whole memory.

LGTM=r
R=golang-codereviews, r
CC=bradfitz, golang-codereviews, iant, khr
https://codereview.appspot.com/50250045

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