FAQ
Change 0b83bb7bb7ec caused perf changes on linux-amd64-perf:

runtime: introduce, use funcPC to convert Go func to PC

This removes the ** unsafe hack.

Real bug fixed at chan.go:101.

LGTM=dave, r, iant
R=golang-codereviews, dave, r, iant
CC=dvyukov, golang-codereviews, khr
https://codereview.appspot.com/140870044

http://code.google.com/p/go/source/detail?r=0b83bb7bb7ec

json-1 old new delta
cputime 167770500 158089900 -5.77
time 167691042 158032255 -5.76

json-2 old new delta
cputime 169370590 160690050 -5.13
time 84845941 80488555 -5.14

json-4 old new delta
cputime 170910675 162270140 -5.06
time 43247175 41069467 -5.04

json-8 old new delta
cputime 182739420 173938868 -4.82
time 23041741 21976955 -4.62

json-16 old new delta
cputime 313731608 306131130 -2.42
time 19817304 19327874 -2.47

http://build.golang.org/perfdetail?commit=0b83bb7bb7ec705538e89577c4f0da9ff37b4fbe&commit0=2008238cdc04dc6419ab75310eb8e6ee17098481&kind=builder&builder=linux-amd64-perf

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