[release-branch.go1.4] reflect: Fix reflect.funcLayout.  The GC bitmap has two bits per

««« CL 182160043 / 321d04dea9d6
reflect: Fix reflect.funcLayout.  The GC bitmap has two bits per
pointer, not one.

Fixes issue 9179

LGTM=iant, rsc
R=golang-codereviews, iant, rsc
CC=golang-codereviews
https://codereview.appspot.com/182160043
»»»

TBR=khr
CC=golang-codereviews
https://codereview.appspot.com/180440044