go_faq: add question: Why does Go perform badly on benchmark X?
go_faq: add question: Why does Go perform badly on benchmark X?

R=r, cw
CC=golang-dev
http://codereview.appspot.com/895043

Committer: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>

pombredanne/go-deleteme,apparentlymart/golang,gnanderson/go,bdwalton/debian-golang,ssrl/go,bdwalton/debian-golang,h8liu/golang,tv42/old-go,bdwalton/debian-golang,tianon/debian-golang,dsriram/golang,apparentlymart/golang,tv42/old-go,tianon/debian-golang,ssrl/go,h8liu/golang,pombredanne/go-deleteme,dsriram/golang,gnanderson/go,tianon/debian-golang,dsriram/golang,gnanderson/go,pombredanne/go-deleteme,bdwalton/debian-golang,gnanderson/go,dsriram/golang,tianon/debian-golang,apparentlymart/golang,apparentlymart/golang,nightlyone/golang,h8liu/golang,pombredanne/go-deleteme,ssrl/go,bdwalton/debian-golang,ssrl/go,h8liu/golang,tianon/debian-golang,h8liu/golang,tv42/old-go,pombredanne/go-deleteme,dsriram/golang,apparentlymart/golang,ssrl/go,nightlyone/golang,nightlyone/golang,apparentlymart/golang,tv42/old-go,dsriram/golang,tianon/debian-golang,tianon/debian-golang,h8liu/golang,gnanderson/go,ssrl/go,tv42/old-go,bdwalton/debian-golang,nightlyone/golang,ssrl/go,tv42/old-go,nightlyone/golang,dsriram/golang,nightlyone/golang,apparentlymart/golang,tianon/debian-golang,pombredanne/go-deleteme,h8liu/golang,nightlyone/golang,bdwalton/debian-golang,pombredanne/go-deleteme,gnanderson/go,tv42/old-go,gnanderson/go,bdwalton/debian-golang