runtime/pprof: plan9 fails the TestGoroutineSwitch, skip for now.
runtime/pprof: plan9 fails the TestGoroutineSwitch, skip for now.

LGTM=r
R=golang-codereviews, 0intro, r
CC=golang-codereviews
https://codereview.appspot.com/55430043

Committer: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

tv42/old-go,pombredanne/go-deleteme,pombredanne/go-deleteme,tv42/old-go,tv42/old-go,tv42/old-go,pombredanne/go-deleteme,pombredanne/go-deleteme,pombredanne/go-deleteme,pombredanne/go-deleteme,tv42/old-go,tv42/old-go,tv42/old-go,pombredanne/go-deleteme