runtime: fix another race in bgsweep It's possible that bgsweep constantly does not catch up for some reason, in this case runfinq was not woken at all.
runtime: fix another race in bgsweep
It's possible that bgsweep constantly does not catch up for some reason,
in this case runfinq was not woken at all.

R=rsc
CC=golang-codereviews
https://codereview.appspot.com/75940043

wesolows/golang-old,firebitsbr/golang-old,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang-old,wesolows/golang,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang,wesolows/golang,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang,wesolows/golang,firebitsbr/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang