runtime/debug: force GC after setting of GCPercent to make it effective. See also discussion in CL 51010045.
runtime/debug: force GC after setting of GCPercent to make it effective.
See also discussion in CL 51010045.

R=golang-codereviews, r
CC=golang-codereviews
https://codereview.appspot.com/52230043

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